SW20R.
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Tuesday, January 15, 2019 1:03 PM
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Polyurethane motor mounts and exhaust options
Hello all,
Has anyone on the forums used poly motor mounts in their SW20? I have a 97 Bathurst, and I'm looking to change the motor mounts, once and for all. Which ones would you recommend? Powerflex make a few but I'm not sure what diameters are needed as there are multiple options on their website.
The car is making a lot of knocks and rattles from the rear, figured I would just give it an overhaul by going polyurethane everything. The exhaust bracket is also broken, and the exhaust full of holes so I'm looking to get that replaced as well. Would there be any benefit in going with a complete custom system, including exhaust manifold, high flow cats and muffler? Or am I better off just getting a custom catback to replace the rusty section full of holes? I'm not chasing big power gains, I just want it to sound nice and to be efficient.
It has only rattled and clunked since I got the rear suspension upgraded to Koni's and Lovell springs. It was done by Damien at Suspension City, and he seems to know what he's doing. So I'm pretty lost at the moment, was wondering whether that broken exhaust bracket might be the cause.
Regards,
David
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Carmikey
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Re: Polyurethane motor mounts and exhaust options
Tuesday, January 15, 2019 1:33 PM
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Powerflex engine mounts you need are:
PFR76-309 (rears are all the same)
PFR76-311 (73mm front)
Sent from my SM-J320ZN using Tapatalk
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SW20R.
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Re: Polyurethane motor mounts and exhaust options
Tuesday, January 15, 2019 2:23 PM
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Carmikey
Powerflex engine mounts you need are:
PFR76-309 (rears are all the same)
PFR76-311 (73mm front)
Sent from my SM-J320ZN using Tapatalk
Much appreciated mate. How many of each do I need? Any pearls of wisdom on the exhaust?
post edited by SW20R. - Tuesday, January 15, 2019 2:39 PM
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Kook
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Re: Polyurethane motor mounts and exhaust options
Tuesday, January 15, 2019 10:24 PM
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Exhaust shop should be able to make up a new set of pipes for relatively cheap.
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Kook
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Re: Polyurethane motor mounts and exhaust options
Tuesday, January 15, 2019 10:27 PM
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Reddtarga
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Re: Polyurethane motor mounts and exhaust options
Wednesday, January 16, 2019 0:09 PM
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The OEM exhaust headers were pretty efficient and full stainless, so maybe just fit a catback.
With an NA you won't get power gains with a 'high flow' muffler, but instead most people change the OEM one looking for a good sound.
Unless your current cat is clogged there won't be much to gain by changing it.
If you want to replace it go for a 200 cell metal cat, but a good quality one will be expensive.
A 100 cell cat may be too loud.
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Carmikey
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Re: Polyurethane motor mounts and exhaust options
Wednesday, January 16, 2019 0:21 PM
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SW20R.
Carmikey
Powerflex engine mounts you need are:
PFR76-309 (rears are all the same)
PFR76-311 (73mm front)
Sent from my SM-J320ZN using Tapatalk
Much appreciated mate. How many of each do I need?
Any pearls of wisdom on the exhaust?
If you are content with the stock exhaust note, replace with a second hand stock exhaust. Otherwise as mentioned, have exhaust shop replace pipes etc. If interested, i have a stock exhaust from my 1999 Bathurst, If you have problems locating one. Sent from my SM-J320ZN using Tapatalk
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SW20R.
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Re: Polyurethane motor mounts and exhaust options
Wednesday, January 16, 2019 7:42 AM
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Deevon
Exhaust shop should be able to make up a new set of pipes for relatively cheap.
Do you know any good ones in Ballarat? Been quoted 1.3k for high flow cat, new pipes and muffler in stainless. Wondering if it might be cheaper getting it done in Melbourne. Speaking of which, does anyone know a reputable exhaust shop in Melbourne? Reddtarga
The OEM exhaust headers were pretty efficient and full stainless, so maybe just fit a catback.
With an NA you won't get power gains with a 'high flow' muffler, but instead most people change the OEM one looking for a good sound.
Unless your current cat is clogged there won't be much to gain by changing it.
If you want to replace it go for a 200 cell metal cat, but a good quality one will be expensive.
A 100 cell cat may be too loud.
I suspected that would be the case in regards to performance, I really am just after the sound. I like the way mine sounds at the moment, it crackles and pops and makes all the right noises. Just happens to have holes, lots of them.
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Kook
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Re: Polyurethane motor mounts and exhaust options
Wednesday, January 16, 2019 10:14 PM
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SW20R.
Deevon
Exhaust shop should be able to make up a new set of pipes for relatively cheap.
Do you know any good ones in Ballarat? Been quoted 1.3k for high flow cat, new pipes and muffler in stainless. Wondering if it might be cheaper getting it done in Melbourne.
Speaking of which, does anyone know a reputable exhaust shop in Melbourne?
Reddtarga
The OEM exhaust headers were pretty efficient and full stainless, so maybe just fit a catback.
With an NA you won't get power gains with a 'high flow' muffler, but instead most people change the OEM one looking for a good sound.
Unless your current cat is clogged there won't be much to gain by changing it.
If you want to replace it go for a 200 cell metal cat, but a good quality one will be expensive.
A 100 cell cat may be too loud.
I suspected that would be the case in regards to performance, I really am just after the sound. I like the way mine sounds at the moment, it crackles and pops and makes all the right noises. Just happens to have holes, lots of them.
I've always found the guys are Exhaust Bros to be pretty helpful. Also heard good things about west exhausts. I'm meant to be taking my car the Exhaust Bros to get the pipes done, but haven't bothered yet. I'd be hesitant to get a muffler from any of them cause it will just be some generic stuff, is your muffler rusted too or just the pipes?
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SW20R.
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Re: Polyurethane motor mounts and exhaust options
Thursday, January 17, 2019 2:24 AM
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Deevon
I've always found the guys are Exhaust Bros to be pretty helpful. Also heard good things about west exhausts.
I'm meant to be taking my car the Exhaust Bros to get the pipes done, but haven't bothered yet.
I'd be hesitant to get a muffler from any of them cause it will just be some generic stuff, is your muffler rusted too or just the pipes?
Yeah got the quote done at both Exhaust Bros and West Exhausts for 1.3k. That was with the high flow cat, new pipes, muffler and tips. It's just the pipes that are rusted, guess I could just keep the current muffler so save a bit of cash?
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Kook
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Re: Polyurethane motor mounts and exhaust options
Thursday, January 17, 2019 2:44 AM
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SW20R.
Deevon
I've always found the guys are Exhaust Bros to be pretty helpful. Also heard good things about west exhausts.
I'm meant to be taking my car the Exhaust Bros to get the pipes done, but haven't bothered yet.
I'd be hesitant to get a muffler from any of them cause it will just be some generic stuff, is your muffler rusted too or just the pipes?
Yeah got the quote done at both Exhaust Bros and West Exhausts for 1.3k. That was with the high flow cat, new pipes, muffler and tips. It's just the pipes that are rusted, guess I could just keep the current muffler so save a bit of cash?
1.3k sounds about right to me for the full set up. The pipes will be the cheapest part (other than the tips).
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P E T E
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Re: Polyurethane motor mounts and exhaust options
Friday, January 18, 2019 0:01 PM
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I've got one of the kirkosaurus.com inserts for sale if your interested. This will fit one of your front or rear engine mounts. (Be aware that some front engine mounts are different to the rear, in this case, the insert I have will always suit the rear mount).
Just PM me if your interested.
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SW20R.
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Re: Polyurethane motor mounts and exhaust options
Tuesday, January 22, 2019 1:47 PM
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Do you guys know what size catalytic converter is needed? 2.25 or 2.5 inch?
Figured if they wanted to charge me $450 for a cat I could source my own metallic 200 cell cat for a lot less and just get them to fit it for me.
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Reddtarga
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Re: Polyurethane motor mounts and exhaust options
Wednesday, January 23, 2019 0:45 PM
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"$450 for a cat"
That's about what a top quality 'Metal Matrix' metal cat might cost.
With replacement cats, be careful what you buy out of China, because there is a lot of 'knock off' rubbish around that may not be as good as your old cat.
Also many replacement cats are sold without flanges, and are shorter than the OEM cat, so flanges and pipe extensions would need to be welded on = more cost.
If you get an exhaust shop to do it you will probably need to give them your old cat to get the spacing.
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SW20R.
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Re: Polyurethane motor mounts and exhaust options
Wednesday, January 23, 2019 2:24 AM
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Reddtarga
"$450 for a cat"
That's about what a top quality 'Metal Matrix' metal cat might cost.
With replacement cats, be careful what you buy out of China, because there is a lot of 'knock off' rubbish around that may not be as good as your old cat.
Also many replacement cats are sold without flanges, and are shorter than the OEM cat, so flanges and pipe extensions would need to be welded on = more cost.
If you get an exhaust shop to do it you will probably need to give them your old cat to get the spacing.
Any idea on how a Magnaflow one would go? Opinions seem to be mixed on the web, but mainly on their mufflers. I figure a brand name would be better than something generic?
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