I was wondering if the factory intake manifold on my m50 would be alright for around 400hp with the help of a gt30 or gt35 turbo. I see custom intakes on some cars but not others so i really don't know if its necessary to buy a custom one or not.

Also, bang for the buck, who makes the best turbo exhaust manifold? i really like aa but if there's something cheeper and works just as well, i'd prefer that.

I was wondering if the factory intake manifold on my m50 would be alright for around 400hp with the help of a gt30 or gt35 turbo. I see custom intakes on some cars but not others so i really don't know if its necessary to buy a custom one or not.

Also, bang for the buck, who makes the best turbo exhaust manifold? i really like aa but if there's something cheeper and works just as well, i'd prefer that.

Search is your friend on this one ;)

http://forums.bimmerforums.com/forum/showthread.php?t=359390&highlight=exhaust+manifold

Took some finding though but is an excellent thread. Gives you all the options and your best options.... The cast one that is SPA I think is a VERY good bet for $600. The boost logic one is the "best" but is the most pricey at $1800 I think.

As for inlet manifold it depends on your exact car as I know one of the OBD2 manis is restrictive but if its a US M3 one it should be good for well over 400 whp as far as I am aware

ICS has made 997 whp on the stock s50 manifold and stock TB....