1) RB Street Header, RB Downpipe, RB Presilencer, 3" Borla XR-1 Single
About $700 <- About same or little less flow than 3

2) RB Road Race Header, Custom DP, RB 84-85 GSL-SE presilencer, RB Turbo 2 presilencer, 2 2.5" Borla XR-1 Dual
About $1000 <- by far the best flow, each rotor get its own 2.5" exhaust gas outlet

3) RB Street header, RB Downpipe, RB Presilencer, RB Dual Exhaust
About $1100 <- About same as 1, but a looks better and a lot more expensive

I'm leaning towards 1 or 2 for now.

What do you guys think?

Jay Kim

 

RB downpipe and presilencer into N1 Duals

 

Don't go bigger than 2" duel exaust....you'll be sorry. CJ

 

I think I'm set on getting the option #2, but taking pp13bnos' advice and keeping it 2" through. I'm still not sure yet so any advices and opinions would be appreciated.

Jay Kim

 

That's exactly what Fred at Mindtrain said about going over 2" for the headers inside diameters for the two rotor inlets. It's just kills power(at the low end, under 4k rpm?) beyond 2" for an N/A. They tried before on a series 5 motor due to the bigger exhaust ports but they decided to just taper the flange instead of enlarging the diameters. You can give Fred a call at 310.836.4106- he can talk for hours on this stuff. BTW, Fred has been in the rotary header business since 1971. He's kinda of semi-retired now.