I'm going to be upgrading to a HTT HTB2 62/12. I was debating on also installing an aftermarket exhaust manifold at the same time. My truck is a DD & I use it for my side job of small engine repair.

I was wondering what you guys thought of them. Will it help in the MPG department (even a little)? Or would I be better off spending the extra $ somewhere else?

Also if you could please recommend an exhaust manifold, I'm leaning toward ATS.

Thanks in advance!

 

the benefit of those aftermarket manifolds is that they're double or triple pieces. that helps them not to crack during expansion and contraction.

The stock manifold is known the crack because if being a one piece design. The flow is a little better with aftermarkets but, not enough to say you will get any benefit from it.

 

I'd only buy one if my stocker was cracked and needed a replacment.

Stock is good for 1,000hp

 

Your stocker will eventually crack,I don't think you will too happy stripping the twins for a crack.Do it at the same time.

Bob

 

yep, what ^^^ said

 

would you change out even if going to an aftermarket single?

 

sorry dude... the thread is about exhaust manifolds...

 

I put a manifold and a modded CP3 on last week and I'll tell you my turbo has never spooled quicker. It spools faster than the stock turbo did when my truck was lightly modified. I attribute the improvement largely to the manifold. HP wise you probably won't see a diff. but efficiency wise the turbo will spool quicker and the exhaust is better utilized.

 

your already in there, I would do it anyways

 

it seems like it's a 'it can only help and you've already got the turbo out' kinda deal. anyway i really hate to have to do things twice. any manifold better than the other- i know ats has a 2 piece and a 3 piece.

 

Your only options right now are the ATS and the BD. They are both two piece pulse manifolds for the 3rd gen. HTT advertises one for the 3rd gens, but they don't have it available yet.

 

you could always go with headers. I forget the maker but, they were at the DHRA event in Houston with some really cool chrome plated headers for 2nd and 3rd gens.

Maybe someone that was there will post in with who it was.

 

now that sounds pretty interesting. i would definitely like to check that out- i wonder if exhaust leaks are still an issue with headers? i remember that being a constant problem with vehicles that i put headers on in the past.

 

I've always heard that cast manifolds were better for turbos, due to the extreme heat that they can handle without cracking. Tubular headers are prone to cracking at the welds and bends when used under extreme load / heat situations.

This could be a mute point now with some of the treatments they have for metals allowing them to withstand more extreme situations.

David

 

I believe haisey machine makes header for the 2nd and 3rd gens.....
I have pics of it somewhere??? I will try and find them