Performance oriented exhausts. Too many potential bad choices.
I went with the TurboXS exhaust and have been very pleased with it. I had great results with that company with my Subaru and expected the same. Great sound, I felt a difference, and cost wise it was feasible. Buy used and save some dough.
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From: SoCal
Originally Posted by ceddyluv82
I read on this site, I can go back and check through the hundreds of posts.. but someone putting a three inch catback exhaust noticed a drop in acceleration power. Back when I had my tahoe I put a flowmaster exhaust on it with 3 inch piping... and experienced the SAME problem. I also put a K & N air filter on the truck and with both mods combined... I had near zero acceleration power. I put the stock exhaust and stock air box back on the truck.. and voila I had my torque back. I am somewhat confused/want to know more about correct pipe sizing needed for the horsepower the car has stock to notice the most gains. I am sure if I did alot of engine work to my tahoe back then... the larger diameter piping would of benefited me throughout the powerband, but in the case I had no mods besides those and had a huge loss. I hope this is making sense.
Back pressure for street driving might be more linked to throttle response than anything else and in low mod NA situations there may be a perciveable loss in response but not realy much loss in power to say OMG I lost power
WHen I ran at the track I would run OPEN HEADER and always went FASTER.....no restriction and max flow....dyno showed a nice hump of extra power going open header and the slips reflected it
On the street it felt soggy -----WOT it made more power and went faster
I wouldnt reccomend running open header on a Z on the street but you get the idea about back pressure.....a properly tuned exhaust will make more power than open BUT your talking tuned to perfection and tons of man hours sizing it PERFECTLY for the exact power and flow THAT motor is putting out
ONe motor may like a certain combo better than another......which means lots of dyno time for THAT combo of parts.....if you change one thing the exhaust must be retuned for that new combo
NA is about the parts working together.....once you have ALL your NA mods done is when you can fine tune the exhaust.......it sucks but in realilty you can buy a small exhaust now to maintain great response on the street now and then go custom once you finish your engine mods and have an exhaust tuned for you by guys like Hytech.....it wont be cheap but it will make the most power for YOUR setup
Originally Posted by BlueBoxer
I went with the TurboXS exhaust and have been very pleased with it. I had great results with that company with my Subaru and expected the same. Great sound, I felt a difference, and cost wise it was feasible. Buy used and save some dough.
Awesome sound too!
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From: Long Island
Originally Posted by SergEK
DO you have before and after dynos'? Do you have before and after slips? No most likely......the butt dyno isnt an accurate measure of anything
Back pressure for street driving might be more linked to throttle response than anything else and in low mod NA situations there may be a perciveable loss in response but not realy much loss in power to say OMG I lost power
WHen I ran at the track I would run OPEN HEADER and always went FASTER.....no restriction and max flow....dyno showed a nice hump of extra power going open header and the slips reflected it
On the street it felt soggy -----WOT it made more power and went faster
I wouldnt reccomend running open header on a Z on the street but you get the idea about back pressure.....a properly tuned exhaust will make more power than open BUT your talking tuned to perfection and tons of man hours sizing it PERFECTLY for the exact power and flow THAT motor is putting out
ONe motor may like a certain combo better than another......which means lots of dyno time for THAT combo of parts.....if you change one thing the exhaust must be retuned for that new combo
NA is about the parts working together.....once you have ALL your NA mods done is when you can fine tune the exhaust.......it sucks but in realilty you can buy a small exhaust now to maintain great response on the street now and then go custom once you finish your engine mods and have an exhaust tuned for you by guys like Hytech.....it wont be cheap but it will make the most power for YOUR setup
Back pressure for street driving might be more linked to throttle response than anything else and in low mod NA situations there may be a perciveable loss in response but not realy much loss in power to say OMG I lost power
WHen I ran at the track I would run OPEN HEADER and always went FASTER.....no restriction and max flow....dyno showed a nice hump of extra power going open header and the slips reflected it
On the street it felt soggy -----WOT it made more power and went faster
I wouldnt reccomend running open header on a Z on the street but you get the idea about back pressure.....a properly tuned exhaust will make more power than open BUT your talking tuned to perfection and tons of man hours sizing it PERFECTLY for the exact power and flow THAT motor is putting out
ONe motor may like a certain combo better than another......which means lots of dyno time for THAT combo of parts.....if you change one thing the exhaust must be retuned for that new combo
NA is about the parts working together.....once you have ALL your NA mods done is when you can fine tune the exhaust.......it sucks but in realilty you can buy a small exhaust now to maintain great response on the street now and then go custom once you finish your engine mods and have an exhaust tuned for you by guys like Hytech.....it wont be cheap but it will make the most power for YOUR setup
Trust me, my tahoe was DEAD on power when I had the exhaust and the air filter. A mother in a caravan filled with kids passed me on a highway and I was flooring it LOL
The problem with your tahoe might have been you were running lean. It seems without recalibrating for added airflow newer cars lose power. Its funny because you add potential airflow but lose power. I had a wrx and after a cat back exhaust the car lost power all over. needed a reflash.
Originally Posted by ceddyluv82
Of course too much back pressure is not going to help you. That's why restrictive stock exhausts are swapped for free flowing exhausts. Too much free flowing is not good either...
Last edited by gothchick; Apr 12, 2007 at 12:42 PM.
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