MAC shorties header question for CA folk
08-12-2010, 10:58 AM
#1
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Thread Starter
MAC shorties header question for CA folk Anyone on here from CA run MAC shorty headers?
Currently I have a GMMG catback and was wondering if it would be a lot more raspier if I was to throw MAC shorties on there with the stock catted Y pipe.
I'm also asking this, because I would like to add headers eventually but I don't want to deal with the hassle of finding a "smog guy" or taking off the headers come smog time. So I'm trying to stay CA emissions legal, or at least fool em.
Thoughts/advice anyone???
Currently I have a GMMG catback and was wondering if it would be a lot more raspier if I was to throw MAC shorties on there with the stock catted Y pipe.
I'm also asking this, because I would like to add headers eventually but I don't want to deal with the hassle of finding a "smog guy" or taking off the headers come smog time. So I'm trying to stay CA emissions legal, or at least fool em.
Thoughts/advice anyone???
08-12-2010, 03:48 PM
#3
I run mac mid lengths. You will run into trouble trying to smog with those. To answer the question? I don't know..lol. I have run them with a catless y-pipe & cutout & it's pretty loud. I have run them without the cats & cutout closed & it sounds almost stock. The best sound is the headers, cats & cutout. That's what I run right now.
08-12-2010, 05:36 PM
#5
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Well if I wasn't in California, obviously.
The whole point of this post was to work around the smog with another option that doesn't involve finding a "smog guy" or pulling em off everytime I need it smogged.
Thats why Long Tubes won't work for me right now.
The whole point of this post was to work around the smog with another option that doesn't involve finding a "smog guy" or pulling em off everytime I need it smogged.
Thats why Long Tubes won't work for me right now.
08-12-2010, 05:43 PM
#6
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08-12-2010, 07:10 PM
#7
Well they make cam's called stealth and cheater cams. But for a smog legal build, I'd probably go with a 224R cam from Texas Speed with a 114 LSA. Should pass smog with no problems with all emissions equipment hooked up and stock cats.
If you have a '98-'00 car, then you should look into either get the SLP LS6 intake w/ EGR provision, or getting a stock LS6 intake and modifying it to accept the EGR tube. That with the cam will net you some nice gains.
UD pulley is another bolt-on you should get. After that the only real way to get anymore power and possibly stay smog legal is to add boost.
If you have a '98-'00 car, then you should look into either get the SLP LS6 intake w/ EGR provision, or getting a stock LS6 intake and modifying it to accept the EGR tube. That with the cam will net you some nice gains.
UD pulley is another bolt-on you should get. After that the only real way to get anymore power and possibly stay smog legal is to add boost.
Last edited by ss.slp.ls1; 08-12-2010 at 07:38 PM.
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A friend of mine has a 224 cam with stock manifolds and it sounds good 
08-13-2010, 12:56 AM
#10
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Thread Starter
I have an 02 m6 WS6, so I believe I already have the LS6 intake on there from the factory.
I have heard that the manifolds on the 2002 LS1's are pretty good as well for what they are, so shorties may not even yield much.
I just installed the GMMG catback and an SLP lid and I have the stock LS6 intake.
If I were to add the 224R cam with a 114 LSA and a pulley with a dyo tune.
Is it possible for me to see 350 rwhp without headers??????????????????????
My car feels strong, it trapped at 108mph in the 1/4 mile... 100 pct stock aside from the K&N filter.
Final thoughts?? And as always, I appreciate the advice and feedback from all of you.
I have heard that the manifolds on the 2002 LS1's are pretty good as well for what they are, so shorties may not even yield much.
I just installed the GMMG catback and an SLP lid and I have the stock LS6 intake.
If I were to add the 224R cam with a 114 LSA and a pulley with a dyo tune.
Is it possible for me to see 350 rwhp without headers??????????????????????
My car feels strong, it trapped at 108mph in the 1/4 mile... 100 pct stock aside from the K&N filter.
Final thoughts?? And as always, I appreciate the advice and feedback from all of you.
08-13-2010, 11:22 AM
#11
I have an 02 m6 WS6, so I believe I already have the LS6 intake on there from the factory.
I have heard that the manifolds on the 2002 LS1's are pretty good as well for what they are, so shorties may not even yield much.
I just installed the GMMG catback and an SLP lid and I have the stock LS6 intake.
If I were to add the 224R cam with a 114 LSA and a pulley with a dyo tune.
Is it possible for me to see 350 rwhp without headers??????????????????????
My car feels strong, it trapped at 108mph in the 1/4 mile... 100 pct stock aside from the K&N filter.
Final thoughts?? And as always, I appreciate the advice and feedback from all of you.
I have heard that the manifolds on the 2002 LS1's are pretty good as well for what they are, so shorties may not even yield much.
I just installed the GMMG catback and an SLP lid and I have the stock LS6 intake.
If I were to add the 224R cam with a 114 LSA and a pulley with a dyo tune.
Is it possible for me to see 350 rwhp without headers??????????????????????
My car feels strong, it trapped at 108mph in the 1/4 mile... 100 pct stock aside from the K&N filter.
Final thoughts?? And as always, I appreciate the advice and feedback from all of you.
08-13-2010, 09:21 PM
#12
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I have JBA coated shorties and there is a difference. I didn't want to deal with the smog gods either so I went with these. With the mods listed I have run a 13.3 @ Fontana spinning the tires down the track.
Last edited by ur jlus; 08-13-2010 at 09:26 PM.
08-15-2010, 10:44 PM
#14
Shorties do gain a small amount, especially on pre 01 cars. They also sound slightly better. I am thinking about running a set still for the same reason. Make sure they have your years smog fittings and you should have no problem.
A 224 cam may or may not pass smog. My 224 on a 114 was clearly cammed, there was no way a smog tech with half a brain wouldn't have noticed. Thunder racing sells a nice cam for cars that need to pass smog, on a bone stock car (otherwise) with their cheatr cam and AFR 205 combo they made like 395rwhp and still completely smoggable.
A 224 cam may or may not pass smog. My 224 on a 114 was clearly cammed, there was no way a smog tech with half a brain wouldn't have noticed. Thunder racing sells a nice cam for cars that need to pass smog, on a bone stock car (otherwise) with their cheatr cam and AFR 205 combo they made like 395rwhp and still completely smoggable.
08-15-2010, 11:30 PM
#15
I have an 02 m6 WS6, so I believe I already have the LS6 intake on there from the factory.
I have heard that the manifolds on the 2002 LS1's are pretty good as well for what they are, so shorties may not even yield much.
I just installed the GMMG catback and an SLP lid and I have the stock LS6 intake.
If I were to add the 224R cam with a 114 LSA and a pulley with a dyo tune.
Is it possible for me to see 350 rwhp without headers??????????????????????
My car feels strong, it trapped at 108mph in the 1/4 mile... 100 pct stock aside from the K&N filter.
Final thoughts?? And as always, I appreciate the advice and feedback from all of you.
I have heard that the manifolds on the 2002 LS1's are pretty good as well for what they are, so shorties may not even yield much.
I just installed the GMMG catback and an SLP lid and I have the stock LS6 intake.
If I were to add the 224R cam with a 114 LSA and a pulley with a dyo tune.
Is it possible for me to see 350 rwhp without headers??????????????????????
My car feels strong, it trapped at 108mph in the 1/4 mile... 100 pct stock aside from the K&N filter.
Final thoughts?? And as always, I appreciate the advice and feedback from all of you.
Lid, De-screened stock MAF, P&P TB, Stock LS6 Intake, TSP 224R (114LSA), Comp 918s, Stock 01-02 exhaust Manifolds/Cats, SLP Y-Pipe, Loudmouth 1, Powerbond U/D Pulley, Performabuilt 9.5" 4000rpm Stall, Level 2 4L60e trans, Racetronix Fuel pump, Summit Girdle w/3.73s and some UMI goodies thrown in.
Dyno tuned by Rick@Synergy, she made 350RWHP/352RWTQ. Passed smog with no issues.
Like Arc said, the AFR 205s are smog legal (have a CARB number for them), and if im not mistaken, atleast -4 degrees overlap will keep you smoggable. Your biggest issue with smog will be that all your smog equipment is there, mods shouldnt matter as long as it passes the sniffer.
Last edited by NVR_SPDS; 08-15-2010 at 11:37 PM.
08-16-2010, 06:46 PM
#17
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Have a friend that runs a smog shop, he tells me that then the shop that shows on the computer for the last smog can get in trouble and loose their smog permit, so he won't touch anything that even looks or smells off a bit.
I know we modified a LS6 intake to accept the egr, well, visually look like it had an egr on it. I never got around to installing it, selling the SS, so will be selling that intake here soon......
Cheers
RustyNCA
08-16-2010, 06:50 PM
#18
Like I said, it doesn't matter what it sounds like. Even if the cop pulls you over and makes you pop your hood, as long as you have CARB legal headers & intake, all emissions and stock cats, legal exhaust, you're fine.
Last edited by ss.slp.ls1; 08-16-2010 at 06:56 PM.
08-16-2010, 11:00 PM
#19
Not necessarily. If they can't make a determination right there, they can send you to the smog ref. Its a slim chance, but possible. I was talking about smog stations, who can refuse to pass your car since they can get fined and their license revoked if they pass an illegal car.