Replace my muffler with straight pipe
 

Replace my muffler with straight pipe and if i do what size is best?

what are you running? stock port/street/bridge? 12a or 13b?

I am going with 2.5" 1/8thick T300, stockport 12a. I would stick with 2.25, but I am dropping in a balf bridge/street port motor in it in a while, and dont want to do the exhaust twice.

huh? I'm a little confused... we're here to help but we're not psychics. You have to be more explicite in your questions. I'm not sure why you'd be repalcing your MUFFLER with straight pipe... more common to replace your catalytic converters with straight pipe, also called race/test pipe. If that's what you're talking about then 2.5" is about as big as you'd wanna go with any N/A rotary. But also remember to check your state's emission laws as removing your cats is illegal in most states and comes with a pretty hefty fine.

I noticed that you don't have many posts here so you may be new to the RX-7 community, and if so you should be warned that nearly ANY exhaust modification to a rotary will make it louder, sometimes WAY to loud. Alt of this has already been covered so check out the archives/faqs... that's a good place to start.

i replaced my cats with a straight pipe on my stock port 13b and it loud. louder than i now care for

i replaced my cats with a straight pipe on my stock port 13b and its loud. louder than i now care for so be careful on what all you replace.

i replaced my cats with a race/test pipe and it didnt really make it louder at all just changed the sound to a deeper more pingy rotary sound which is very nice and its not loud ..

Well i just have a stock 12A and its a 1982 Mazda Rx-7 my muffler is bent really bad and SCCA is coming up.I went to a Exhaust shop and ask what can i do and he said straight pipe from muffler or a flowmaster muffler for like 120$ what should i do?

I have a stockport 12A

Heres what I did and loved it! I bought about 7' of 1/8" 2.5"Diameter from an exhayst shop for like $35? Found a 2.5" flange, they tac welded the flange on for free. Then I drove to Shucks (auto parts storr) Got a raptor muffler for $25. mounted it all on and loved it! definately best bang per buck!

On a side note I put the straight pipe on, then my girlfriend at the time needed me to come over for something right then, so then Im thinking 'Well my friends open header 454 sounds pretty badass, Ill just drive over there now and get a muffler tomorrow.

HOLY SHIT!!! I could feel my brain bouncing off the sides of my skull at anything over 3k rpm. Ill bet its at least as loud as a piston airplane up close, if not more so! that was one deafening 20 mile ride... I felt sorry for the people around when I hit traffic.

Don't feel sorry ... you're just infesting them with the rotary sound disease :P Can be lethal to the point you have to go out and buy yourself an RX-7 :D

don't do it! rotaries are too loud as it is... I use a Miata mufler... My work is 15 minutes away from home and my family can tell if I'm late...

Oh, that story was just a side note DRIVING WITH *NO* MUFFLER. The Raptor was suprisingly quiet. About as quiet as a stock 8cyl Ferrari. Certainly not illegeal loud.

And LOL @ RX7 disease! :rlaugh: