What's a good performance muffler (s) to replace the stock ones? Just a more performance sound, not loud per say.

 

Racing beat

 

I appreciate all the input. But got a new question!!!! I've had my '86 RX-7 at the body shop and I'm thinking they flooded it. Then I went over to start it and right away herd it turning over different.
Watching YouTube do I put ATF or motor oil into all the spark plugs holes to get the compression back??????????

 

Don't put anything in it yet.

Open the hood and take out the EGI fuse. Get into the car, floor the gas pedal, and turn it over for 10-15 seconds.

Then put the fuse back, get in the car, floor the pedal, and the moment it starts release the pedal.

If this doesn't work, you can try oil.

Don't use ATF.