The collectors are 3 1/2 inch rather then the standard 3" exhausts sold for our cars. I'm thinking about getting a set...

are you guys going custom or what?

what mufflers are you running?

thanks!!

 

nobody is running these headers? I talked to a local exhaust shop and they said they dont even carry 3 1/2 pipe. lol

 

Most places won't carry pipe larger than 3". You'll have to call around to a lot of different places, try places that work on big diesel trucks as those systems can run up to 4".

 

Just get the pipe off of summit or jegs, then take it to the exhaust shop to weld it up.

 

Thats what i would do

 

I dont think summit has 3 1/2 inch x pipes.

 

Jermzz, It sounds like you need to contact me. I have Y-pipe options that may do the trick. If you go to the AR Headers website you can get a good look at what we have offer. Here's the link. http://www.americanracingheaders.com/LS1RaceSystem.htm

Thanks.
Nick
631-608-1986

 

kooks sales reducers from 3.5"-3". That's what I'm going to go with for my set-up. Which is going to be a set of kooks 1 7/8"-2" with 3.5" collector going to a 3" Texas speed x-pipe.

 

is that desirable? why would you want to reduce exhaust flow? the whole reason for going to a bigger header is for more exhaust flow, right?


might as well stick with 1 7/8 and 3" x pipe...

 

yes, i'll do that, Nick. Thanks.

 

because I don't want to spend $400 on a 3.5" y pipe when I've already got a $400 exhaust system. I really don't think I'm going to be leaving that much on the table. Plus it's only a 404ci motor anyways

 

cool. sounds to me like you bought headers that were too big though.

i dont wanna bottle neck my exhaust, it just seems pointless.

I can't justify spending 1000 dollars on headers bigger then my 1 7/8 and bogging them down to flow the same amount as a 1 7/8 header flows.

 

well I bought these headers cheaper than what you can buy a new set of 1 7/8's for. And it gives me some growing room, right?

 

You want to increase flow and increase exhaust velocity. If you add more flow to what is needed, you'll slow the exhaust down and lose power. Ideally, you want to shrink your exhaust as it goes. The largest exhaust area is needed at the front of the exhaust because it's hottest so therefore its volume is greatest. As the exhaust cools, it condenses and takes up a lot less space. Therefore, running larger piping all the way back will limit velocity and add too much flow, hurting performance. If you have 2" headers and then funnel the gas into the reducers, the reducers will actually increase the velocity of the exhaust. This would benefit you if 3" exhaust provides enough flow at that point. It could be a good thing.

 

nice, can you get me a deal like that? lol

yeah, I suppose you have growing room, that's good atleast!! you should just spend the little extra cash and set it up to 3 1/2 inch so you dont waste money later down the road!

but too each his own, you know more about your car then I ever will.

I can't believe there's not more people running these headers!?

 

I'm about to call ARH. What you say makes some good sense, I'll see if they agree with you.

Maybe a reducer would work with a true dual system. I dont understand why we dont see more people doing it this way if that's the case.

 

If that was the case they would step the headers the other way instead of bigger.

I want a set of headers that go 2" to 2 1/8th to 2 1/4... With a 4" collector

I would not reccomend making your tubing smaller.

 

Jermzz We offer multiple y pipe options for our product feel free to call or go to our web site www.kookscustomheaders.com. As for you having an exhaust shop do a true dual set up for you let me know what raw materials you need and I will make a package deal for you. Toll free 1 866 586 KOOK George R.

 

Because most people that go the route of custom exhaust don't have a very nice system after it's all done. Most custom exhaust pictures I see are hacked up, lousy bends, bad welds...

Most people attribute larger exhaust to more power, too. It's not true, but people don't tend to see it that way. It's one of those things that you don't realize unless you're well versed in fluid mechanics or someone takes the time to explain it. Most people have just never thought about it before.

 

Then you're really going to slow down the exhaust. What you're saying makes a lot more sense if you're running open headers IMO. If you're going to run a full exhaust system, making it bigger is really going to slow things down, and as the exhaust gases cool, you want to maintain velocity, not destroy it.