Noticing on decelaration .... anythoughts

I am missing a muffler lol
FYI NSFW I cuss

http://www.youtube.com/watch?v=hq3R2h7zLfg

 

could be a fuel / tuning issue. I know that mine was backfiring when the car was running on the rich side

 

Im going to bring it to a local shop once the exhaust gets put on tomorrow... so maybe this weekend so that I can get a compression test and a look over from an rx7 specialist.

 

idle set too high or throttle cable doesnt release all the way. normally if u give it just a hair of gas while decelerating it does that. if it was adjusted correctly. i have an s5 engine with intakes and an s4 throttle cable. im always ****** with it cuz its too short and its always giving it i tiny bit too much gas with my foot off. also my buddy has a 3 inch catback on his n/a and it does it all the time, and loud as hell. might be back pressure issue

 

Imma look into that. Got more questions but Imma bring this down to the tuning section.... meh Ill ask in another thread

 

Fixed the exhaust now here is a little vid of it driving. Still back fires as you can hear.

http://www.youtube.com/watch?v=jXq2Tx8l_QE

 

unburned fuel in the exhaust manifold igniting under the heat & exhaust pressure. stock computer runs rich naturally. Talked a long time ago with mech who was 1 of 13 specialist for mazda from 85-95 for rotary with the end of the rx7 in the US.