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Do I really need a 3" inch exhaust?

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Old 03-14-2011, 06:47 PM
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u only need 3inch if you have a turbo. if you plan to go 2.6 pulley (stupid) then keep your exhaust otherwise 2.50 is perfect. u might even gain a few hp/tq from downsizing
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Old 03-14-2011, 06:50 PM
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2.5 would prolly work for me right now but gonna get the TVS blower so prolly will keep the 3" to accommodate the new blower setup.
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Old 03-14-2011, 11:59 PM
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Why is an exhaust question in the drivetrain forum?
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Old 03-15-2011, 07:07 PM
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Originally Posted by Superman_Davin
Why is an exhaust question in the drivetrain forum?
why not & who cares?
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Old 03-15-2011, 07:19 PM
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general rule of thumb is 300whp+ =3" exhaust...and even then your only losing like 5-10whp with a 2.5" compared to 3"

listen to Staged07SS though, he knows his ****
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Old 03-15-2011, 07:30 PM
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Originally Posted by RooTBeeR
general rule of thumb is 300whp+ =3" exhaust...and even then your only losing like 5-10whp with a 2.5" compared to 3"

listen to Staged07SS though, he knows his ****
yep, hence the new superturbo muffler
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Old 03-16-2011, 11:59 AM
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Originally Posted by RooTBeeR
general rule of thumb is 300whp+ =3" exhaust...and even then your only losing like 5-10whp with a 2.5" compared to 3"

listen to Staged07SS though, he knows his ****
Why thank you sir
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Old 03-20-2011, 10:41 PM
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Originally Posted by RooTBeeR
and even then your only losing like 5-10whp with a 2.5" compared to 3"
5-10whp with a 3" as opposed to 2.5" at 300whp? You're high.

I would say if you're stock blower, stick with 2.5" as, like Staged said, and we all know, 95% of this forum is not hitting 300whp on the M62.
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Old 03-21-2011, 10:40 AM
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Originally Posted by LSJ
5-10whp with a 3" as opposed to 2.5" at 300whp? You're high.

I would say if you're stock blower, stick with 2.5" as, like Staged said, and we all know, 95% of this forum is not hitting 300whp on the M62.
I never mentioned anything about stock blower..."Rule of Thumb" is what i believe i said, not a spot on definite point at which you would have to go bigger
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Old 03-21-2011, 11:31 AM
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I will be close. I put down 261 on saturday and couldnt really get on it too much due to some afr issues. I am gonna have the tune tweaked a little and go for it again. I should be 270 - 290 whp. Then I plan on buying a tvs very soon. Hopefully this week.
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Old 03-21-2011, 11:47 AM
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where did you pick the muffler up at? cost? i may have to scrap my mag for one
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Old 03-21-2011, 11:49 AM
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Ordered from JEGS. Cant remember how much but I know it was less than $100. I think it was like $60 - $70 with shipping included.
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Old 03-21-2011, 05:00 PM
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Originally Posted by RooTBeeR
I never mentioned anything about stock blower..."Rule of Thumb" is what i believe i said, not a spot on definite point at which you would have to go bigger
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Old 03-23-2011, 12:21 PM
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Originally Posted by nizzle
I got the Dynomax Superturbo muffler and it works GREAT. Much quieter than the magnaflow or the dynomax vt series but not too quiet. You can still hear the exhaust well but it has a deeper less harsh tone. Also I did not loose ANY power!! Ran a 13.15 @ 114 before the muffler swap and ran the exact same time and mph after the swap. The superturbo get the 2 thumbs and the 2 big toes up from me. 1/4 time and mph via aeroforce interceptor scan gauge.
Just dont go to the track and expect anywhere close to that, or you will be dissapointed. Nice dyno numbers for your mods though.
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Old 03-23-2011, 12:30 PM
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Originally Posted by InfraRedline
Just dont go to the track and expect anywhere close to that, or you will be dissapointed. Nice dyno numbers for your mods though.
I know. I am going to test the accuracy of the gauge at the track next month. I doubt it is that fast too but I was really just stating that I dont believe I lost any power due to the muffler swap. Low's 13's would be great.
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Old 03-23-2011, 12:39 PM
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I use the dynomax VT on my turbo van, if I upgrade the stock muffler on the HHR SS thats the one I'm going with.
Pretty quite at idle and partial throttle and has a nice tone at wot.
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Old 03-23-2011, 01:40 PM
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Originally Posted by nizzle
I know. I am going to test the accuracy of the gauge at the track next month. I doubt it is that fast too but I was really just stating that I dont believe I lost any power due to the muffler swap. Low's 13's would be great.
Low 13's is possible with some DR's. Your trap most likely wont be over 106-107mph though, which is perfectly healthy for your mods.
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Old 03-23-2011, 02:53 PM
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Originally Posted by HHRSSouth
I use the dynomax VT on my turbo van, if I upgrade the stock muffler on the HHR SS thats the one I'm going with.
Pretty quite at idle and partial throttle and has a nice tone at wot.
Yea the VT is a str8 thru design with a flap that opens and closes. I love the idea but was too loud with the rest of my exhaust mods I have. That's why I switched to the super turbo.
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Old 03-23-2011, 02:59 PM
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Originally Posted by nizzle
Yea the VT is a str8 thru design with a flap that opens and closes. I love the idea but was too loud with the rest of my exhaust mods I have. That's why I switched to the super turbo.
Really? My turbo van has a 2.4 in it with same size exhaust we use, but bigger turbo and I don't thinks its loud.
But you know how it is, different strokes for different folks.
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Old 03-23-2011, 04:06 PM
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Originally Posted by HHRSSouth
Really? My turbo van has a 2.4 in it with same size exhaust we use, but bigger turbo and I don't thinks its loud.
But you know how it is, different strokes for different folks.
Right right. Also a turbo car's exhaust might be a little quieter than a s/c.
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Old 03-23-2011, 04:46 PM
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Originally Posted by nizzle
I got the Dynomax Superturbo muffler and it works GREAT. Much quieter than the magnaflow or the dynomax vt series but not too quiet. You can still hear the exhaust well but it has a deeper less harsh tone. Also I did not loose ANY power!! Ran a 13.15 @ 114 before the muffler swap and ran the exact same time and mph after the swap. The superturbo get the 2 thumbs and the 2 big toes up from me. 1/4 time and mph via aeroforce interceptor scan gauge.
Thats great man, I luv my dynomax superturbo muffler also. I had the same problem as you my setup was originally too loud for my taste. I have 4-1 clearimage header 2.5 inch downpipe/highflow cat and a 2.5 tsudo exhaust. The tsudo exhaust made my car too loud so I went with a custom 2.5 inch exhaust consisting of the cti 2.5 inch axel kit and the dynomax muffler. It sounds great!.
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Old 03-23-2011, 04:48 PM
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Originally Posted by olivecj
Thats great man, I luv my dynomax superturbo muffler also. I had the same problem as you my setup was originally too loud for my taste. I have 4-1 clearimage header 2.5 inch downpipe/highflow cat and a 2.5 tsudo exhaust. The tsudo exhaust made my car too loud so I went with a custom 2.5 inch exhaust consisting of the cti 2.5 inch axel kit and the dynomax muffler. It sounds great!.

Yep. I luv mine.
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Old 03-23-2011, 06:51 PM
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Originally Posted by nizzle
Yep. I luv mine.
Awesome, you should post a vid when you get the chance.
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