This is my first rx-7 and i need to know if i actually need exhaust back pressure for the motor to run decent or can i just straight pipe it...... please help

 

What year and model car do you have?

 

if you have a turbo then you dont but you would have to port the wastegate. if it is an NA im pretty sure that youre 5/6 ports will not open..and you have to have the airpump still installed.search for 5/6port and see what you can find...i know theres alot of info out there

 

i am pretty sure thats what my car has and it sounds like **** it also makes a pop corn popping sound which is hella annoying... its a 1990 s5 n/a

 

its an N/A so yes you have to

1. keep the cat (or go str8 pipe and have the exhast shop weld the split air pipe flange to the test pipe)

2. Use the smog pump to open the ports (this is what i did easy as hell and the parts only cost me around $25.

If you just slap a test pipe on and do nothing for the 2 ports youll lose alot of top end power.

 

Beyond the 5/6 ports NO engine needs backpressure to run better. What they need is exhaust tuning.

 

can an n/a detonate???? popcorn to me is a bad thing im turbo....

 

wait why would it be bad if it sounds like popcorn???? sorry for the hijack

 

yeah you could run a straight pipe if u wanted to you adont need a the pick up tube off the cat like a s4 would

 

sounds like Popcorn because it Is Backfiring!.NO back pressure..and Punching the gas off and ON ..Equals.FLAMES out the tailpipe!(backfire!)..Sharpie's got an N/A GXLBiscuit..

 

Sweet I can make flames! Nanana batman!

But how do i fix this? Just get rid of the current exhaust and get a new one made with a cat?

And sorry for the hijack

 

Why Fix it.?.It Fixes Tailgaters ..real quick!..Ya..throw the cat back on with the Split air tube hooked up and you get rid of it..Sorry to step on the Thread..apologies to the Original Poster.

 

so if it dosent need the pick up ture, how do the 5,6th ports work?

 

Series 5's 5th and 6th ports are opened by the air pump, not back pressure from the exhaust like S4's.

 

ture dat, i forgot he said s5