where is a good place to get good straight piping on a decent budget of about $2-300 I've checked rx7.com but im not to sure about the straight piping on there?

are there any other suggestions? I have already changed all the exhaust from the engine but Im still getting popping and back firing noises because of the rest of the system.

Jeff- 88 SE RX-7 S4

oh and is there a way to look up serial numbers on the engines online? And in Idaho we don't have Emissions so exhaust is not a problem just noise

 

unless remanufactured the engine not come with a serial number.

 

ok make sense. moving on to main point where is a good place for exhaust? cause the car is being re done for performance untill the engine goes out then will be replace with a turbo model engine and the N/a will be rebuilt later.

but for now I would love to get some track worthy exhaust

 

Straight pipe, bends, collectors, etc:
Find Custom Exhaust, Header Collectors, Race Mufflers & More | Burns Stainless

Track-worthy exhaust:
http://definedautoworks.com/prod2_1.html

If you disabled the anti-afterburn system, then this will happen when decelerating. A racing exhaust system will just make it louder.