I have an S4 FC low miles. I was just curious how what kind of gains I could expect with the following.

-Switched to Royal Purple 1HP?
-Pacesetter header 5hp?
-Cat back 3hp?
-hi flow cat 2hp?
-K&N filter or Racing beat intake 1-2hp?

I'm trying to stay in the same class in autoX (or not move up too much). Any other worthwhile bolt ons?

 

Sneak some Pineapple Racing Port Sleeve Inserts in there.

Edit: Good thread...

https://www.rx7club.com/showthread.p...ear#post229200

 

Thanks! I forgot I could have the TB bored out. Are there any ECU upgrades I hear most of the power difference between the S4 13B and S5 13B is in the electronics. If I could gain maybe 7hp with an aftermarket ECU I'd be fairly happy.

 

The RTEK-7 2.0 has just been released for the S4 NA. $399 and you'll need a Palm compatible PDA...

http://digitaltuning.com/index.php?p...age=2&ecu=S4NA

Port & Polish on the TB may not gain much, but removing the secondary throttle plates is worth doing.

A little down in this recent thread is good stuff on intake mods and their efficacy:

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/some-questions-about-gasket-matching-manifold-porting-638610/

 

If I can drop my car down to 2500lbs and get the power up to about 170 crank hp. I'll be fairly happy. That should knock me below 7 seconds on the 0-60 hopefully.