hi, i'm helping port and rebuild a s4 (s4 rotors) 6port n/a, we are doing a rebuild with an atkins kit and are street porting the housings ourself by using the atkins rebuild dvd, a 6port street port porting plate we orderd from mazdatrix, and the porting dvd from mazdatrix. this car has a rb header, CAI, and plugwires for hp goodies. I was just wondering what would be resonable hp number for this car.

thanxs

 

148 hp , maybe around 155-160 with safc

 

Expect 160-170whp depending on quality of exhaust.

 

we are going to make our own test/cat delete pipe and put on a Cork Sport cat back exhaust system. so a a/f controler would help?

 

Add an S5 intake manifold to that list and you'll get a bit more, but yea, probably 170whp would be pushing it.