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Question: Sport exhaust and air filter for my bmw m3 e46?

(Posted by: Sean O on 2008-12-08 17:15:56)

I have a BMW M3 E46 343 horse power and need to know what kind of horse power will it give me if I install a Sport Exhaust and a air filter?

Posted by: Kid on 2008-12-08, 17:22:49

The factory exhaust is fairly decent already. So, ballpark... maybe 20 or 25. I've never done it on a Bimmer. Actually I got about 30 on a 350Z. If you've got the green for a GOOD exhaust system then go for it, it's not going to hurt you.

Posted by: g on 2008-12-10, 16:42:25

Remember the rated add-ons from these installations is at the crank, and even if it puts through additional 20hp little of it gets to the rear wheels - for the power you are running in terms of real performance - gain will be negligible (better sound maybe). really considering your car already delivers a thumping plus 300hp to get a serious performance increase you will have to go supercharger or turbocharger. since it will be low boost (under 7 pounds say) i would recommend a supercharger (turbos are great for high boost) -lighter -easier/ cheaper installation -runs cooler at boost this will give you a true gain when you WOT (wide open throttle) of 125hp plus. cheers 04 cobra