Best Exhaust For Horsepower Gains - Pontiac GTO Forum
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post #1 of 6 (permalink) Old 03-17-2018, 07:17 PM Thread Starter
 
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Best Exhaust For Horsepower Gains

Hey guys! New 2006 owner here. Just bought an all black 6.0 that already has a Kooks cat back on it. I was wondering what the BEST exhaust for horsepower gains would be including headers all the way back. I've looked at spintech, kooks, and slp so far and I love the sound on all of them but my main concern is adding the most power possible besides straight pipes in my case.
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post #2 of 6 (permalink) Old 03-18-2018, 08:06 AM
 
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IMO, they all produce about the same. What makes a difference is the tune.
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post #3 of 6 (permalink) Old 03-18-2018, 08:07 AM
 
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The exhaust system from the cats back wont give you any neglegble hp gains on a fairly stockish car. Its mostly just how u want the car to sound.

Longtube headers with catless mids or high flow catted mids (along with a tune) with net u the best HP jump over any other simple mods for the gto.

Also will want an over the radiator cold air intake to get the most out of it.

2006 GTO M6

Motor - Stock with Vararam
Bunch of suspension
Bunch of brakes
Stock tune

365/368 std
12.81 @ 110.6 2.03 60'
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post #4 of 6 (permalink) Old 03-21-2018, 03:47 PM Thread Starter
 
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Yeah I already ordered a Vararam and im about to get this baby dyno tuned. Just curious if one exhaust has a better flow if at all.
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post #5 of 6 (permalink) Old 03-27-2018, 10:20 PM
 
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Kooks long tubes. Lose the cats. Don't tune til you get the headers installed. Waste of money tuning for maybe 2-4 hp from CAI install. My 2 cents.
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post #6 of 6 (permalink) Old 05-19-2018, 11:21 AM Thread Starter
 
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Originally Posted by SB71 View Post
Kooks long tubes. Lose the cats. Don't tune til you get the headers installed. Waste of money tuning for maybe 2-4 hp from CAI install. My 2 cents.
Thats exactly what i ended up going for. I actually just got some Kooks LTs now. After that I had 3 inch straight pipes built and then connected to a Kooks Afterburner straight through axleback. Im loving this set up so far. Along with the Vararam I can already feel some extra kick. Gonna hit the dyno soon.
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  Pontiac GTO Forum > The 2004-2006 GTO > Intake and Exhaust Discussions

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