Headers and the law

[Bill Lalk]

Does anyone know if installing headers on the MM is a legal mod in WI? Milw to be precise. I want Kooks with 2 high flow cats and high flow mufflers and keep tips, for now. I do live in an emissions county, but I see oxygen senser holes in the rear of the Kooks.

[sailsmen]

Does anyone know if installing headers on the MM is a legal mod in WI? Milw to be precise. I want Kooks with 2 high flow cats and high flow mufflers and keep tips, for now. I do live in an emissions county, but I see oxygen senser holes in the rear of the Kooks.

Have them installed out of state and they are legal, keep a copy of the reciept in the glove box. Not the trunk or that is considered transported material.

[yjmud]

yes and no
I would not worry about it

[yjmud]

[QUOTE=sailsmen;968039]Have them installed out of state and they are legal, keep a copy of the reciept in the glove box. Not the trunk or that is considered transported material.

that would meen you would have to have it done in IL

[musclemerc]

If your worried about all it then you need headers with a Cali carb certification.
JBA shorty's are the only ones that have the certification stamp. None of the LT mfg's have a carb certification

[MCAT]

I instaled S & W headers w/highflow cats, myself this last spring, & I passed no problem several weeks ago.

that being said I highly recomend you do not do headers just change your mufflers instead.

P.s I live in Waukesha CO.

[Rockettman]

That's another reason to get it dynoed after the header install. If you don't, the A/F mixture will be way out of whack, and may cause a fail.
If dynoed, everything will be adjusted properly (if it's done right).

[Bradley G]

Can you say why you give this advice about keeping the stock Logs(exhaust Manifolds) loose bolts?, Leaks?, cracks? Too much NVH?
Too Difficult install?


I instaled S & W headers w/highflow cats, myself this last spring, & I passed no problem several weeks ago.

that being said I highly recomend you do not do headers just change your mufflers instead.

P.s I live in Waukesha CO.

[Zack]

I can install them for you for cheap

[yjmud]

I can install them for you for cheap
what is your price

[Zack]

what is your price


$350 Headers Alone
$400 if you want the X on there too

[blazen71]

In WI, all Emmissions does is plug into the OBDII and make sure the computer in communicating correctly and no DTC's. I passed just fine with my set-up!

[Rockettman]

I saw somewhere in these threads that there is a plug or "bung" on these shorties that has to have something done to it. I think someone said something about the Cobras having something on there, but we don't.

[MCAT]

Can you say why you give this advice about keeping the stock Logs(exhaust Manifolds) loose bolts?, Leaks?, cracks? Too much NVH?
Too Difficult install?

Even with a Trilogy you notice a big difference in responsiveness on the street, the car is a lot louder than I would have liked after the headers,
every one say's it's not that bad and it sounds good, but in the car it can some times give you the sensation that you have a bad muffler, in other words you loose the stealthyness of the car, you get a lot of noise before you get the big acceleration, and cars have ran in the 11's with the factory exhuast, in my opinion headers of any kind are not really neccesary untill you forge your bottom end, you can make more power
than the stock assembly can handle without even touching the exhaust.

headers (S&W) are not that hard to install, however I recommend backing out the bolts on the drivers side mount (the ones that go into the block)(do not remove completetly) and jack up this side of the block so you remove & install the dip stick with out any problems (the dip stick needs room between the engine & the mount) & you have to take off the the serpintine belt & the ac compressor, to get the pass side on, I all so am pro header coatings (cuts down on a lot of heat)(I coated the cats, no heat shields needed) reaching some of the bolts is a pain, you just need to sacrifice a wrench or two (grind/modify) all in all with my complaints it's not enough to swap back, & they do look kick a$$:D

sound is fairly quite with normal driving however the wife complaines:run: when you go to pass some one & the resulting blast stirs the sleeping children in the back seat:laugh:

[MCAT]

In WI, all Emmissions does is plug into the OBDII and make sure the computer in communicating correctly and no DTC's. I passed just fine with my set-up!

Dave did you get your shorties on?

[fastblackmerc]

I saw somewhere in these threads that there is a plug or "bung" on these shorties that has to have something done to it. I think someone said something about the Cobras having something on there, but we don't.

You need to at least tack weld the plug. If you don't it will blow out.

[Bill Lalk]

I think I decided to leave the factory manifolds on, which have the 02 sensors in them, but I would like to remove 2 rear cats(or replace all 4 with 2 highflows) and the too small H pipe with a stainless steel 2.25" X or H pipe. Then connect that up to the stock mufflers and have the 2" input stretched out to at least 2.25"(or 2.38" to accept the new 2.25" H pipe). If this makes sense to you boys, where could I buy the S.S. pipes that would bolt up to stock manifolds? Everything I look at bolts up to headers.

[blazen71]

Dave did you get your shorties on?
Not till next year. I'm still looking for an h/x-pipe.

[MCAT]

I think I decided to leave the factory manifolds on, which have the 02 sensors in them, but I would like to remove 2 rear cats(or replace all 4 with 2 highflows) and the too small H pipe with a stainless steel 2.25" X or H pipe. Then connect that up to the stock mufflers and have the 2" input stretched out to at least 2.25"(or 2.38" to accept the new 2.25" H pipe). If this makes sense to you boys, where could I buy the S.S. pipes that would bolt up to stock manifolds? Everything I look at bolts up to headers.

you have to have it custom made unless you can find some cobra or mach1 manifolds, than you can buy after market H or X pipes to hook up to them, however you will have to add something like 7" or 8" to their length.

[blazen71]

in my opinion headers of any kind are not really neccesary untill you forge your bottom end, you can make more power
than the stock assembly can handle without even touching the exhaust.



long tubes will help an N/a car, even if stock

[MCAT]

long tubes will help an N/a car, even if stock

I agree, however it changes the feel of the car,(N/a or S/c) they kind of give you that feeling that the power band moves a little higher in the rpm range, I know they should make more low to mid range torque, but they sure don't feel like they do, I guess my feelings are that if the marauder is to see more steet duty than track, I would leave the exhaust manifolds last on my list to change, just because of how kicka$$ a marauder feels with a S/C alone.

Blazen71--not to worry, I don't regret buying the S&W's from you, I always wanted to up-grade the exhaust just like the Intake. I would have gone the shorty route if someone made a better looking set, im just not a big fan of what's available.

[blazen71]

You made the right choice ;)

[Zack]

Back in the day we dyno'ed SergntMac's KB Marauder with stock exhaust.

Then we put a complete shorty header system, high flow cats and a bassani X-pipe then re dyno'ed it. We never left the shop, because we did the work AT the dyno.

ZERO gains.