I'm going to have a custom exhaust (header back) exhaust put on my stock 12a as the first part of trying to get some more power out of it. what would you guys suggest for size and muffler. im in south dakota so its pretty cheap around here and no emissions to worry about, i plan in the soon futher to do a holly car setup alone with a streetport this next winter. any suggestions?

 

go 3" magnaflow or borla. i have megan racing mufflers on my TII and those sound great also.

 

2.25" exhaust tubing, preferably thick pipe from Racing Beat.

Your muffler options are:
Magnaflow
Borla
Racingbeat
Rotaflow (spelled right?)

Those are known to withstand the heat of the rotary engine. Normally, 2" would do but since you have a SP in your future a 2.25 couldn't hurt. Normally one would also run a presilencer, because Header with piping into any of the above mufflers only is realllly loud.

Here is a Pure Borla set-up on my car. RB header, Borla ProXS presilencer, and Mazdaspeed Protege muffler:

http://www.youtube.com/watch?v=XMEMkpTTLIw&NR=1
http://www.youtube.com/watch?v=V1cPD1TyY1U

Crappy camera, apparently loud noises doesn't pick up well.

 

3" is good on a Turboed 13b.... not for a stockport/SP 12a.

 

what kinda magnaflows?

 

I love the sound of a Racing Beat Prima Flow....

 

Part #: 14815

Great product and would highly recommend it. The polished stainless looks great too

 

You can go with something different. Flowmaster Hushpower II like I did.

It's different and can handle the heat of the 7. These are sanctioned for the diesel power truck pulls (DHRA approved). So it can definitely handle the heat. I need to update my sig picture to show the new exhaust.

Hushpower II

The Hushpower II incorporates "Jet Laminar technology" together with Flowmaster’s sound chamber designs to give a sweet rumble reminiscent to that mellow 1950's tone in a very compact and presentable case. Constructed in T304 Stainless Steel case that can be highly polished for that show look, or available in a high temp. grey painted T409 Stainless Steel case, both with full stainless steel internals to last for years and years.

Take a look (click on photos to see larger version):

 

Now who makes it so i can search the part #

 

He was referring to magnaflow... A quick search yielded....

http://www.magnaflow.com/02product/s...ne=main&id=761

 

Hello? Are we forgetting about Borla Pro XS and Racing Beat or similar 2" thickwall pipe?

 

My bad not including the brand name.....MAGNAFLOW.

 

https://www.rx7club.com/showpost.php...85&postcount=3

 

I'm with jeff20b on this one.. I was going to get a borla pro xs but my buddy gave me his rb muffler. RB or Borla for me. Great quality

 

RB header to RB muffler for me. Thickwalled in between of course

 

magnaflow sounds amazing on my car, many times better sounding then the rb muffler

 

magnaflow for me too........ http://media.putfile.com/bridgeported-supercharged-13b http://media.putfile.com/BRIDGPORTED-13B-COMPILATION

 

Either one of these is a great choice.
1. Racing Beat '81-'83 PowerPulse(Primaflow) rear....allows for long dual primary system for max power.
2. Rotaflo from Rotaflo.com.au: Excellent muffling with great looks. Needs custom piping .

 

A nice oval exhuast or maybe a triangle shaped one from FlowMaster?

or if you're really crazy some cherrybombs!

 

I gotta admit, cheerybombs sound great for the first hour running!