MY07 GT-B 2.5L Exhaust

Exhaust modifications

MY07 GT-B 2.5L Exhaust

Postby carnifex » Thu Jun 05, 2014 11:41 pm

Looking at getting exhaust & tune in the near future and trying to decide on what to get. After something with a decent note that has a nice low rumble when in low revs/cruising and a bit of a bark when you put your foot down. Don't want anything over the top that will be too loud/droney or attract the Policia.

From reading various threads and listening to sound clips i've narrowed it down to the following:

- Tcp turbo back exhaust > One clip i've found sounds perfect but unsure if it will be too loud?
- Tcp dump & mid into into stock mufflers > Stock mufflers might keep noise down a bit and look stealth, unsure if they will restrict flow or be too quiet?
- Tcp dump + stock mid + Tcp quads > Unsure if mid will restrict flow and what effect it would have on noise?
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Re: MY07 GT-B 2.5L Exhaust

Postby Shakibsaifi » Thu Jun 05, 2014 11:49 pm

Stock mufflers are extremely restrictive. If I was you I'd go the last option. If it's too quiet you can always slap on a mid pipe
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Re: MY07 GT-B 2.5L Exhaust

Postby Manaz » Fri Jun 06, 2014 12:00 am

Shakibsaifi wrote:Stock mufflers are extremely restrictive.


Replacing them would be lucky to get you 5kW, or somewhere around a 3% power gain. That doesn't indicate that they're severely restrictive...
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Re: MY07 GT-B 2.5L Exhaust

Postby Shakibsaifi » Fri Jun 06, 2014 7:59 am

Manaz wrote:
Shakibsaifi wrote:Stock mufflers are extremely restrictive.


Replacing them would be lucky to get you 5kW, or somewhere around a 3% power gain. That doesn't indicate that they're severely restrictive...


Wasnt talking about power restriction.
Moreover Noise suppression
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Re: MY07 GT-B 2.5L Exhaust

Postby bigBADbenny » Fri Jun 06, 2014 9:33 am

3" tbe with center hotdog res can be droney on cruise so going for an oval mid muff is the best solution esp if going perfoance muffs eg tcp.
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Re: MY07 GT-B 2.5L Exhaust

Postby alexxxz » Fri Jun 06, 2014 10:53 am

invidia q300 in stock with troy from PSR are now quieter, I am getting one of these installed in 4 weeks time
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Re: MY07 GT-B 2.5L Exhaust

Postby shav » Fri Jun 06, 2014 11:17 am

I have an Invidia dump with s/s Ultrex 3" from the dump back into single tip mufflers. Once carboned up, the noise is quite moderate. No drone. Got a real rexy rumble to it. If that is too loud, I would get a hotdog resi fitted to remove more of the noise.
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Re: MY07 GT-B 2.5L Exhaust

Postby bigBADbenny » Fri Jun 06, 2014 12:46 pm

Shakibsaifi wrote:Stock mufflers are extremely restrictive. If I was you I'd go the last option. If it's too quiet you can always slap on a mid pipe


Apparently not a performance restriction till after 200 atw according to MSR iirc. And very quiet.
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Re: MY07 GT-B 2.5L Exhaust

Postby Shakibsaifi » Fri Jun 06, 2014 2:59 pm

bigBADbenny wrote:
Shakibsaifi wrote:Stock mufflers are extremely restrictive. If I was you I'd go the last option. If it's too quiet you can always slap on a mid pipe


Apparently not a performance restriction till after 200 atw according to MSR iirc. And very quiet.


I'll repeat I'm talking moreover sound restrictive. Not power
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Re: MY07 GT-B 2.5L Exhaust

Postby munjai » Fri Jun 06, 2014 6:34 pm

i have an Invidia dump, xforce mid/y-pipe and tcp quads on my GTB
not bad when cruising but can be a bit loud when putting your foot down.

https://www.youtube.com/watch?v=SdXmjR-FcjA
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Re: MY07 GT-B 2.5L Exhaust

Postby bigBADbenny » Fri Jun 06, 2014 6:43 pm

Hot dog center may be a little more bearable on a sedan, sedans suppress nvh to a greater degree compared to wagons, OP didn't specify.
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Re: MY07 GT-B 2.5L Exhaust

Postby carnifex » Fri Jun 06, 2014 11:07 pm

Thanks for the replies lads. Had a reply from garage88, moar phat dumps coming at the start of next month so that's another option.

bigBADbenny wrote:3" tbe with center hotdog res can be droney on cruise so going for an oval mid muff is the best solution esp if going perfoance muffs eg tcp.

bigBADbenny wrote:Hot dog center may be a little more bearable on a sedan, sedans suppress nvh to a greater degree compared to wagons, OP didn't specify.


Any suggestions on a mid muff? Forgot to mention it is a Sedan.

shav wrote:I have an Invidia dump with s/s Ultrex 3" from the dump back into single tip mufflers. Once carboned up, the noise is quite moderate. No drone. Got a real rexy rumble to it. If that is too loud, I would get a hotdog resi fitted to remove more of the noise.


Sounds good, any sound clips, how long did it take to carbon up?

munjai wrote:i have an Invidia dump, xforce mid/y-pipe and tcp quads on my GTB
not bad when cruising but can be a bit loud when putting your foot down.

https://www.youtube.com/watch?v=SdXmjR-FcjA


Sounds tuff mate, where did you find the xforce mid/y-pipe?
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Re: MY07 GT-B 2.5L Exhaust

Postby munjai » Fri Jun 06, 2014 11:58 pm

carnifex wrote:
munjai wrote:i have an Invidia dump, xforce mid/y-pipe and tcp quads on my GTB
not bad when cruising but can be a bit loud when putting your foot down.

https://www.youtube.com/watch?v=SdXmjR-FcjA


Sounds tuff mate, where did you find the xforce mid/y-pipe?


Bought the xforce mid/y pipe from bestmufflers.com, but looks like they don't sell the mid/y pipe by itself now.
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Re: MY07 GT-B 2.5L Exhaust

Postby bigBADbenny » Sat Jun 07, 2014 12:17 am

Something like this preferably straight through:

http://www.bestmufflers.com/bshop/advan ... 102&y=-270
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Re: MY07 GT-B 2.5L Exhaust

Postby Shakibsaifi » Sat Jun 07, 2014 12:39 am

Best mufflers have been selling mid pipes again :roll:
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