PO420 Exhaust Code?

bripolar66 · 05-21-2011, 11:20 AM

i put z1 test pipes on at work yesterday, drove home and went right back (on my day off) to work and put my cats back on. test pipes sound like poo. i wish i knew that. my fault for not looking further into it. no SES light tho.

i reccomend to get your a/f ratio checked if u dont have some sort of monitoring system already which most of u probably do about 50 miles after test pipes installed. go to nissan and get a tech to drive with you with the cunsult 3 to check your alphas. mine was rich as hell, it may have changed if i kept them on longer. they really did sound awful. i was pissed.

TopElement · 04-18-2012, 08:25 PM

Quote:

Originally Posted by bripolar66

i put z1 test pipes on at work yesterday, drove home and went right back (on my day off) to work and put my cats back on. test pipes sound like poo. i wish i knew that. my fault for not looking further into it. no SES light tho.

i reccomend to get your a/f ratio checked if u dont have some sort of monitoring system already which most of u probably do about 50 miles after test pipes installed. go to nissan and get a tech to drive with you with the cunsult 3 to check your alphas. mine was rich as hell, it may have changed if i kept them on longer. they really did sound awful. i was pissed.

I know this thread is a little dated, but were the test pipes installed with an otherwise stock exhaust?
Surprised it would sound like crap just from removing the cats which act like resonators. I'd think with plenty of other resonator/muffler in the exhaust to smooth out the tone, it would only be louder.

gomer_110 · 04-18-2012, 08:48 PM

Quote:

Originally Posted by TopElement

I know this thread is a little dated, but were the test pipes installed with an otherwise stock exhaust?
Surprised it would sound like crap just from removing the cats which act like resonators. I'd think with plenty of other resonator/muffler in the exhaust to smooth out the tone, it would only be louder.

My guess is it was the notorious hiss on decel that the VQ is known for when you're running TP's or LTH's. I'm running LTH's and I have to say the hiss is a more pronounced than I thought it would be.

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05-21-2011, 11:20 AM	#1 (permalink)
bripolar66 Base Member Join Date: Apr 2011 Location: north carolina Posts: 30 Drives: 2015 370Z NISMO Rep Power: 14	i put z1 test pipes on at work yesterday, drove home and went right back (on my day off) to work and put my cats back on. test pipes sound like poo. i wish i knew that. my fault for not looking further into it. no SES light tho. i reccomend to get your a/f ratio checked if u dont have some sort of monitoring system already which most of u probably do about 50 miles after test pipes installed. go to nissan and get a tech to drive with you with the cunsult 3 to check your alphas. mine was rich as hell, it may have changed if i kept them on longer. they really did sound awful. i was pissed.