Test Pipe or HFC?
 

I'm on the Fence with going HFC or TP and after weeks of searching can't find any good posts :shakes head: on One versus the other for A:Performance B:CEL lights

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i'm with you trying to determine what to go with. but the more research i do the more confused i get. i just don't to put money into something and it sound like a ricer no harm meant to anyone just feel that way..... or maybe i should have said a honda with a tin can stuck on it

test pipes
pros: best flowing, no restrictions what so ever, yummy gas smell?
cons: WAY louder in comparison to hfc, both rasp, drone, exhaust note, a good alternative to this are the ART pipes, which have a separate resonance chamber. some are made with the j-tube style o2 bung to trick the o2 sensor for no CEL, some don't. Smell (some hate it, some actually love it)

high flow cats
pros: no smell, theoretically shouldn't trip the o2 sensor, should flow similar to the test pipe, but obviously not as much
cons: more expensive, cores can possibly break or come loose, especially if you track your car, the excessive high temp exhaust gas will have an effect on the core

I have hfc's and will be switching to test pipes. They are cheaper, safer and provide more gains. Should have just gone with them from the start.

I wouldn't say our engine sounds very honda ricey with test pipes, it's a much bigger engine than you might see on those hondas with pop can exhaust.

370z Fast Intentions CBE 18" Resonators, Resonated Test Pipes, Stillen Gen 3 CAI - YouTube

http://www.the370z.com/intake-exhaus...ml#post1854022

ART Pipes FTW!

Resonated TPs or punched cats, when through it all on my 350z, non res,res,high flow,and last, punched cats, this is my number one option, looks like cats, and flows better, just add some defoulers to the sensors. I bought a set of used cats for 50 bucks and went to town, some scrap yards will even buy the platinum out of the cats.

From what I have read unless you have FI I would suggest Resonated TPs .. Also on a NA car they seem to make a bit more power because your not losing backpressure.. FI engine's need no backpressure...

Good post man.. I'm in the same boat..

Thank you everyone for your replies...

Was hoping someone here with TP on a Z would chime in if they have a CEL issue?:confused:

I'm still as unsure as before :wtf2:

To pay double for the HFC and still no guarantee of CEL :confused:

You need to read up on what backpressure does to an engine. FI or NA it doesnt matter. Backpressure reduces horsepower

There's no guarantee with either that it won't throw a CEL, most guys get an Uprev reflash and disable the code in the tune

CEL was my biggest concern, disabling via uprev is a workaround not a solution. Went with ART pipes, v3, new factory gasket design. No leaks, quality product and most of all no CEL. Expensive...yes...but worth every penny to get get what you pay for. Getting a cheaper product in the beginning will only cost more in the end.

Interesting I haven't read any posts stating this yet, back to the research:tiphat:

spacing the sensor away from the exhaust flow to trick it into thinking it isn't flowing as much and as a result not getting an accurate reading to the ecu sounds more like a work around to me..

Disabling the DTC in the uprev tune doesn't disable the sensor it just stops it from throwing the code when it detects abnormal parameters.. IE too much exhaust flow.