Low budget exhaust!!

jrb55gh

What are the worms when swapping out the oem cats?

gomer_110

demon bolts. Do a search on here and you'll understand.

__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock

Jordo!

Oh, there's a few...

1. The aptly nick-named "demon bolts", as another member noted.

2. Unforgiving rasp and rattle on decel (if unresonated TP's are used).

3. The potential for a CEL if the ECU detects too much similarity in voltage changes between primary and secondary O2's.

4. Passing emissions, if that's a thing in your state; (NB: #3 and #4 are both possible problems even with HFC's, and resonated HFC's are advised as well...)

5. Possible fuel odors (probably more for those running TP's untuned...)

6. A tune is not "required" but is highly advisable. Pulling the cats makes for significant differences in flow and also means less heat at the head, so you can dial in more timing -- the OEM cats are arguably the greatest bottleneck on the car, and swapping the cats out for either HFC's or TP's is a high bang-for-the-buck mod in terms of power gain.

Nothing insurmountable, but not quite as easy as just swapping out the cat back and calling it a day.

__________________
Enjoy it. Destroy it.

Bigd4mcc

Yeah I was doing a little research on all the issues with hfc and test pipes resonated and non resonated. I wanted to do my own set up with 2.5 inch all the way back with x pipe and about 18 inch resonators in the midpipe area with top speed axle back exhaust. I'm thinking about testing that out to see how it sounds, and then I'm going with the obvious tune, uprev

__________________
2010 base with sport package. Hps hoses with k&n drop ins, custom axle back exhaust. 1/4 mile 13.7

luigi90210

Don't worry about the smell or rasp, its not nearly as bad as people make it out to be. With my set up I couldn't even hear the rasp/hiss the test pipes make, before the axle back I could but the car was a lot quieter with the stock Nismo muffler. As long as your exhaust is fully resonated(would have 4 resonators if you go with your setup) you won't get any rasp. And I couldn't smell the gas unless I was at a red light and had the windows down. People behind me on the other hand now that's a different story. I've had my friends complain about the smell when they would follow me places.

__________________
SOLD 370z
New Car:classified
DD:2011 Mini Cooper S stock

Bigd4mcc

You wouldn't happen to have a video of the way it sounds would you? What exact set up did you have? Yeah I wasn't too worried about the rasp , nothing a resonator or two can't fix, the smell im not worried about. Its the performance and the sound. Those are the only things I care about.

__________________
2010 base with sport package. Hps hoses with k&n drop ins, custom axle back exhaust. 1/4 mile 13.7

luigi90210

__________________
SOLD 370z
New Car:classified
DD:2011 Mini Cooper S stock

Bigd4mcc

I kind of like the sound of that. I might just give that a try, thanks bro.

__________________
2010 base with sport package. Hps hoses with k&n drop ins, custom axle back exhaust. 1/4 mile 13.7