Will long tubed headers bolt on?

[[email protected]]

I bought a 03 silverado Z71 it has aftermarket exhaust already I'm looking to put on long tubed headers. I was wondering if they would bolt on to the exhaust? It has stock headers as of now.

[Chris]

Long tubes will not just bolt on. You have to move or lose the cats(illegal so do at your own risk) . Cutting and welding will be involved

 

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[EX-F150 owner]

I am not sure if it is the same with GM as it was with the F150 I had but, I had a set of Dynatech Supermaxx LT headers with HF cats that came with the kit. This kit did bolt on and did not require any cutting or welding. Not cheap though http://www.dynatechheaders.com/sm_chevytruck_62.html

[Chris]

bolted diretly to your cat-back flanges without cutting that?

[EX-F150 owner]

I don't know. I purchased the complete setup that included the headers and cats, that setup will fit the oem or aftermarket exhaust. If you take a look at their site you can search the installation instructions for all the vehicles they fit.

[Chris]

My guess is it included a Y pipe sized to fit. Cats and a Y are add ons, out of the box, without those expect cutting and welding

[[email protected]]

Yeah I didn't think so. Iv welded exhaust before but it's such a pain with just using jacks!

[nickvrebel]

My guess is it included a Y pipe sized to fit. Cats and a Y are add ons, out of the box, without those expect cutting and welding

 

you are correct. I've installed plenty of long tubes on these trucks. You would have to get the Y-pipe that matches the headers to have a straight bolt in operation - BUT - you need to either get a Y-pipe with cats or you will have catalytic converter codes going off.

 

Why do you want long tube headers? really the stock manifolds flow very well. The only time you need long tubes is when you are running a large cam, ported heads and even then it will only make a difference in the higher rpms, which you are in very little while street driving (over 5,000 rpms). It's not worth the trouble for a street truck. The trucks I put them on were serious trucks set up for drag racing.

[99kon]

you are correct. I've installed plenty of long tubes on these trucks. You would have to get the Y-pipe that matches the headers to have a straight bolt in operation - BUT - you need to either get a Y-pipe with cats or you will have catalytic converter codes going off.

 

Why do you want long tube headers? really the stock manifolds flow very well. The only time you need long tubes is when you are running a large cam, ported heads and even then it will only make a difference in the higher rpms, which you are in very little while street driving (over 5,000 rpms). It's not worth the trouble for a street truck. The trucks I put them on were serious trucks set up for drag racing.

Lets agree to disagree!

Any time you let the motor (stock or modified) breathe better its a good thing. All motors are, is a big air pump. The more efficiently you get air in and out, turns into a more efficient machine.

Tune, intake tube and full exhaust and see how many MPG's and HP you pick up.

Plus installing headers in a truck is way easy, even with the Y pipe install that bolts up to the stock exhaust flange.

[MB2008LTZ]

Well I don't think that headers are nailed on or glued on for that matter....So I sure hope they bolt on!

[EX-F150 owner]

Lets agree to disagree!

Any time you let the motor (stock or modified) breathe better its a good thing. All motors are, is a big air pump. The more efficiently you get air in and out, turns into a more efficient machine.

Tune, intake tube and full exhaust and see how many MPG's and HP you pick up.

Plus installing headers in a truck is way easy, even with the Y pipe install that bolts up to the stock exhaust flange.

I installed Headers on my last truck. The headers netted me 19HP. If that is worth the cost then go for it. IMO most exhaust work is done for sound, if you want power forced induction is a better way to go. I had the Dynatech system installed with a Corsa SI/SO catback and a 3.5" intake. And it was dyno tuned. Cost was over 3K everything installed and tuned.

This was in a 2005 F150 4x4 5.4L All said and done I was putting down 276HP and 338TQ (rear wheels) on a truck that was factory rated for 300HP and 365TQ (flywheel).

[MikeNH]

You won't see those gains on a GM V8. The stock manifolds may be ugly but they flow well.