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i got a 08 taffy white 4dr si bought a few months ago and bought hfp lip kit and other outside looks but know i wanna go with performance. my question is which exaust system,headers and intake would give me da most performance?
 

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on more of a budget i would get the injen and dc sports.
 

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Best performance mod is suspension, brakes, wheels and tires. The word 'performance' is not equivocal to speed.

For speed, exhaust and header are the best places to start; the exhaust system will always be needing an upgrade whether your ride stays naturally-aspirated (NA), or forced induction: supercharged or turbo charged (FI). A port-matched and polished intake manifold would be an expensive but good option for NA, as well as lighter weight pulleys. Other engine mods (like cams) are limited by a lack of tuning (i.e., electronic control; fuel, timing, ignition, and cam angle adjustments for optimum engine performance.)

It's been debated here whether an intake provides gains over a throttle body spacer or plenum for more air volume before compression. Evidence points that a spacer may be best over an intake.


US$.02-- worth what you paid for.
 

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If you're on a budget I say get

Aem/injen CAI
TB spacer+ 2 gaskets
DCRH
Skunk2 70mm exhaust. If you want a softer exhaust a vibrant will do.

If if you want more power with an exhaust get a 3 inch piping. The K-series motors likes to breath.
 
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