What can I get away with in CA, exhaust wise - BMW M5 Forum and M6 Forums
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post #1 of 24 Old 2nd November 2017, 05:09 AM Thread Starter
SCStowaway
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What can I get away with in CA, exhaust wise

Looking to get and exhaust on a 2006. I was thinking an x-pipe and mufflers. Id love to do a de-cat, maybe down the road one day. but Im curious about secondary cats. an x-pipe would eliminate them correct?? do they have sensors?? Unfortunately I need to be able to pass ca smog. They don't seem to do much visual inspections anymore, so thats a plus. Also, if the secondary cats do have sensors, is there anything on the market that i can get to plug in the sensors to essentially "trick" the computer?? Any thoughts are welcome, thanks in advance!
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post #2 of 24 Old 2nd November 2017, 05:48 AM
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I have the full RPI setup, no problems. Last time I did smog check, they just do the OBDII test to make sure there are no emission codes and all sensors read as ready.

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post #3 of 24 Old 2nd November 2017, 05:52 AM
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I should mention I have stock factory primary cats, only the secondaries deleted. You can do a tune that will turn of a check engine light due to emissions, so you should technically, be able to pass even without any cats at all. However, rolling up for a smog check with a car reeking of gas, might raise some red flags, depending on the testing tech.

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post #4 of 24 Old 2nd November 2017, 06:17 AM
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I think it depends on how you drive.

I'm Running Einhorn Industries Race Headers, track pipe, and x-pipe, with DINAN Section 3 -- for the last couple years. It's loud, if you are over 4000. In town and in my neighborhood, I keep it down. No problems with HBPD or CHP, but I'm not driving like an @$$ on PCH.

With that said, I've been meaning to swap out the track pipe, with my Dinan resonator. I've been saying that for the last two years.

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s85 + (afterthought) 6mt =158,000 miles with no RCOD and counting ...just saying...

2007 Dinan S2 e60 m5 6MT Interlagos Blue; DINAN 3.91 Exploded @8x,xxx ; Performance Gearing 3.91 LSD 3 clutch, 30/50 ramps, R&P polished ; ClutchMasters FX350 clutch and LTW single mass FW @157,000 miles, RPi Oil Cooler/Scoops; DINAN High Flow Air Mass Meter/Intake, DINAN TBs, DINAN pulley, DINAN strut, DINAN Monoballs, FastAttack Tune, w/Kung Fu grip!, Einhorn Industries Race Jedders, track pipe, and x-pipe; DINAN Section 3, DINAN LTW 19x9 ET18, 19x10 ET25, Michelin PS4S 275/35/19 and 305/30/19, Macht Schnell 15mm spacers (front); FERODO FRP3000H race pads; StopTech BBK 6/4 380mm/35mm x 380mm/32mm w/SS lines; RDSport F/R sways; CKS coils w/swift springs, -2.0/-2.5 F/R camber; z3 1.9L SSK, with f10 shifter; F/R G1W-H; Uniden R1, remote ALP 2Rx:1Tx, F/R NetRadar DSP, w/GPS and BT. SprintBooster v3; Euro MDM and DSC off. Fluids: Motul 7100 4T 10w60, Redline ShockProof Lightweight 75w140, Castrol SRF, Unicorn Jizz and Wolfpack Blood; Rod bearings replaced at 84,000 and 150,000 miles!!!

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post #5 of 24 Old 2nd November 2017, 09:28 AM
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Quote:
Originally Posted by Fiftytwoeighty View Post
With that said, I've been meaning to swap out the track pipe, with my Dinan resonator. I've been saying that for the last two years.

Indeed. About time you get on with it.
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post #6 of 24 Old 2nd November 2017, 06:10 PM
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Quote:
Originally Posted by SCStowaway View Post
Looking to get and exhaust on a 2006. I was thinking an x-pipe and mufflers. Id love to do a de-cat, maybe down the road one day. but Im curious about secondary cats. an x-pipe would eliminate them correct?? do they have sensors?? Unfortunately I need to be able to pass ca smog. They don't seem to do much visual inspections anymore, so thats a plus. Also, if the secondary cats do have sensors, is there anything on the market that i can get to plug in the sensors to essentially "trick" the computer?? Any thoughts are welcome, thanks in advance!
Both the pre & post cat sensors are on the exhaust manifold. If you are not going decat then you're good to go. With a decat, you need a stage 3 tune & people have been able to pass SMOG though not sure if that will fly in CA. I'll find out in a year or so.
Removing the resonator on the other hand is not for everyone. Some like it some end up reinstalling it due to drone. Only 1 way to find out......
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post #7 of 24 Old 2nd November 2017, 09:28 PM
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Just thinking out loud here... Will the car trigger a CEL if doing header decat and moving the post-cat sensors after the secondary cat?
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post #8 of 24 Old 3rd November 2017, 02:38 AM Thread Starter
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Thanks for the diagram BadSeed!! clears things up a bit. So primary cats have 2 sensors each, pre and post, second set of cats is unmonitored. I was looking at evolves stock header decat set up, to easily change it out when it comes time for smog. anyone have any experience with that setup?? and other companies make something similar?
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post #9 of 24 Old 3rd November 2017, 02:41 AM Thread Starter
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Quote:
Originally Posted by drewTT View Post
I have the full RPI setup, no problems. Last time I did smog check, they just do the OBDII test to make sure there are no emission codes and all sensors read as ready.
so in the full RPI setup you have, does that eliminate primary and secondary cats?? or just secondary?
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post #10 of 24 Old 3rd November 2017, 05:40 AM
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