I have an 03 Coupe with the HKS true dual exhaust..I need to know if i'm better off with high flows or if i should go straight back and delete the cats all together..Anyone wit experience or suggestions? Please Help!

 

go with some HFC's, test pipes and the HKS produces rasp, and makes it sound kinda crappy

 

My dad has an HKS exhaust on his Z with FI 300 cell HFC's. It sounds great and there is next to no rasp whatsoever

 

^+1
get those

 

The power difference is minimal... On the same day, I did a dyno comparison between the HKS + Crawford cats and then HKS + FI test pipes, which yielded 1whp more. Very unimpressed. The sound with the cats was much better. Check out my videos on youtube. I have a few to hear the difference.

http://www.youtube.com/profile_video...=tommy8897&p=r

 

OP, why do you keep making threads asking the same questions?