How much Horsepower gain can I expect with an intake, Exhaust and headers?

2007 Honda Civic Si Coupe

Short ram intake K&N 69 Series Typhoon

Skunk 2 Mega Power RR exhaust

Skunk2 Alpha header

I would say around 50 with a tune
with out a tune it will not do ****

Without using more fuel in to your engine, maybe 10 to 15 HP.

Just do a cat back exhaust system. If you put headers on you'll lose all low end torque and it will be a dog off the line and you'll need a different cam to compensate for it. The cold air intake that came on the motor from the factory is all you need. The cleanable air filters have oil on them that migrates to the MAF sensor wires and ruins MAF sensors.

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