i just bought a 93 rx7. it didn't come with a cat, just a straight 3" pipe engine to exhaust. its pretty loud and it makes a bobbling sound. just wonderin if what are you usin for a cat and how does it sound. plus does anyone hav trouble with with the car when its just idling?? sometimes my rpm gauge will go up and down and it feels as though its gonna die on me. please let me know what you guys think thankz

 

I am running full custom 4" piping, for a cat i went with Random Technology, but also threw in a Magnaflow as a resonator to help in keeping it quiet. If you are running full 3" exhaust straight threw with out any cat, becareful of leaning out. Do you have a PFC? If not get one, along with the PFC you can have your idle adjustment fixed

 

3inch piping...DP/MP magnaflow cat/ Apexi GT spec. cat back, Loud as hell. Like Mazdabation asked....What ECU do you have? Hunting idle could be a number of things, TPS, vaccum leak, etc.
You should have someone check the car out, to neglect proper set-up and maintenance on these car's could be catastrophic.....

 

whats a pfc?? i guess i'll look that up. do you think if i just put a resonator it'll fix the loud problem of leanin o ut or do i need a cat??

 

anyone know a place where i can take my car around the gta thats good with our car???

 

a large magnaflow stainless steel oval offset muffler placed in the middle of the system (after cat, or in place of a cat) works good at reducing noise and making the tone sound nicer.

 

2.5" RB downpipe, 2.5" Magnaflow, 2.5" piping, and a Huge OBX muffler.

 

Theres a really good shop in Etobicoke called MPS... talk to Steve. His number is 416-252-0866

 

A PFC is a standalone ECU made by Apex'i for all tuned autos.

A resonator only aids in restricting noise levels, because of its straight through design (magnaflow) you will still get leaned out conditions.
A cat on the other hand, even though high flow, will help in restricting flow and richen the mixture a bit.

PS leaning out and noise levels are two different things, by what you have typed it almost sems you have them as the same. take your plugs out and have a look at them. this should give you and idea of your mixture.

Pss what other mods are you running??

 

thankz for all the info guys....i'm new to all this and i'm startin to think that i didn't buy the greatest rx7 out there. all it has is a greddy bov, aftermarket intake, and 3" dp straight to my hks cat back. did all of you storage your cars already. mayb i can meet up with some1 with a fd thats actually running properly so i will know how its suppose to sound. thankz alot guys

 

Bring the thing to me....I'll check it out for ya, does this car have a boost guage?