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Stage 1 SDS @11+ psi
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3,061 Posts
Sure the stock exhaust system is a bit restrictive. But you're not going to see high gains from your test pipe or headers unless you tune it out properly using the ECUFlash. And to be perfectly honest, the gains you get you won't really 'feel.' It's the 74/75 swaps and FI that are the real deal.

I'm not sure the GTS manifold with working butterflies is worth it. Just get the larger plenum intake and you'll be fine.
 

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Stage 1 SDS @11+ psi
Joined
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3,061 Posts
Oh, I misread your post. You already got the working GTS plenum....

Any horsepower gains you will get up will be top, you will lose a little low-end torque. That's what I documented when I got headers installed.
 
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