Bought a Borla cat-back early in 2005, tried a raspy nasty midpipe with it, and quickly changed back to the stock cat.

Some of you may have followed my adventures in creative cat modification - removing the second block of catalyst, downstream from the second O2 sensor; my summer upgrade to the Racing Beat 'race' flash has destroyed what little cat material I had left and by September I was getting the inevitable PO-420 codes from my dead cat.

Well, not unexpected, so time to punch out the rest of my honeycomb - I put the empty cat back on, which is now basically two huge resonators.

The sound is terrific. Not loud until you are well into the throttle, not the least bit raspy, and with no metallic ringing I got with the thin-wall tubing of the midpipe.

Granted, the piece still weighs upwards of twenty pounds, but if you can bear the extra weight - this is the best tone I've heard, so far.

Should have done it years ago.

Will try and get a representative audio clip onto Youtube asap....


S

 

I've been wanting to gut my cat... but I just can't get past having a CEL glaring back at me.

 

you should change your title to "Super Polluter"

 

i also always thought two or three resonators in SERIES gave the best sounds.

 

OMG^^^Killin me!

 

ps: an open chamber is not a resonator, it is known to inhibit flow over a straight piece of pipe tho ... (2 stroke motors excepted)

a single resonator properly sized is the way to go, two or more in series accomplishes nothing useful - been there, done that (using the real thing)

 

nice

 

^^ that's a sweet sound.

Seems very much tolerable for the street.

 

Sounds great. Only problem I can see is that the exhaust in the vid is on a Turbo RX-7(I think lol). Turbo's give a cars exhaust a completely different sound and baffles all the raspyness that N/A cars sometimes have and makes the exhaust note deeper. As I said I think that RX-7 is turbo, if it's not then disregard my entire post heh.

 

Expo1 has a PERFECT DIY for that.
https://www.rx8club.com/series-i-do-yourself-forum-73/diy-cover-tpms-light-47499/


Stealth: Let us know when you've got that audio clip up. Can't wait to hear it...

 

yea, i am having probs with my midpipe. but a voice came to me, and it should get fixed