Do LPP's leak like QTP's?
 

I was going to get a set of QTP's for my car but after a little research people seem to have alot of problems with them leaking at the collector. I guess it's becuase the way it's designed. Only thing is the new LPP's have the same collector design. So my question is, do they leak like the QTP's?

mine seem to be good, no leaks or anything

Do they fit real nice now sense the redesign? How's the DS collector as far as the angle?

I've seen 1 thread about the collector leaking.

Its all in how you mount the pipe, not the brand. You are referring to the joint of the collector to the Y/X pipe right? if so that has nothing to do with brand, it has to do with what style joint you use. A slip fit does not leak if clamped tight enough, a flange will loosen or the gasket will go bad, the coupler type looks like junk to me from the start, and then there are V bands, those can work well but have to be of quality and installed properly.


As far is which is better, you comparing "budget" to "money is no object" basically, the better is obviously QTP.

I don't have any experience with either of these brands, but the end-all answer to leaking is V-Band clamps.

my qtp's dont leak

He's talking about the actual collector. Not about an exhaust leak..... i.e header meets exhaust, cheap band clamp, etc.

My QTPs dont leak either.

No I'm not. I'm talking about where the four pipes meet the collector. If you search I'm sure you will find the threads I was reading about the design of a HVM and how you can't weld the inside of the pipes and how there is a bunch of people talking about there 700 dollar headers leaking at the front of the collector. I don't know if I would really consider a LPP a budget header but yes it is not a Kooks or ARH. I really wouldn't put QTP in with the cream of the crop either.

https://ls1tech.com/forums/showthrea...light=qtp+leak
There are a few people in there talking about theirs leaking. Also the OP didn't say his were leaking but there was about 1/4 inch of weld missing on the DS header where on of the primarys meets the collector.

May not be your definition of budget as far as pricing but they are a budget header, compare them to a higher level name and the parts combined pricing, the high end names will be over 1k. And the quality will definately be budget compared to QTP, ARH, Kooks. Look into ARH they are bad bitches too. The fitment issues are already starting to come up. Give them some time too they were just released. As far as your question I do not have the specific answer.

I dont see why they cant weld up the pipes inside then slip on the collector and weld the outside? I would just look into a different brand. Like ARH, Or Hooker super comps, they also have the "power spear" i.e. the spike, just not the HVMC.

I'm to the point where I don't think it matters anymore. I have heard bad things about every header out there, doesn't matter if there $300 OR $1100. Some people have problems, some people don't. That seems to be for ALL headers. So I guess the question stands, why pay more then you have to, you still may or may not have to notch, cut, loosen, or weld to get your headers in. I think I'll cheap out and go with the LPP's and use the money saved for custom true duals. Thanks 00pooterSS.

Cool PM sent.

Its too deep to weld on the inside without some elaborate/exotic setup.
It would probably add a large cost onto the header price if they did weld it internally.

As far as the outside problem/gap, look at a header where the four pipes come together, you will see they place three pipes in the merge and weld them up all the way around. The fourth pipe is supposed to be a SLIP fit (male into female tube). They place the last pipe in the assembly and then weld around the outside of the tube (as far around the tube as possible).
Welding the inside (between the four tubes to seal the last tube) is near impossible because of the relative short distance between the center line of each pipe (or between the outside diameter of each pipe). If close tolerances are held, and the assembly is done correctly, its a good design.
On some batches QTP will over swedge the hell out of this “slip fit” connection to ensure there are no snaggs when the last tube is assembled into the merge (I assume this is the reason; the alternative reason is simply shitty quality control) - and it leaves a big gap where the four tubes meet (the inside where it's not able to be easily welded). If the gap is swedged too big it will leak big time. It’s the problem I had and many others have experienced.
I stuffed my primary gap with 2500 degree manifold patch. It fixed it but I had other fitment problems as well.
QTP wouldn't assist me in any way, shape, or form so after becoming very annoyed I dumped ‘em and got the ARH system and haven’t looked back, they fit like a glove.

ARH will work with you and modify pretty much any part of their system to your needs at no additional charge, at least they did for me. You just can't beat the customer service Nick gladly provides.

Just my $0.02

Damn I forgot reading about that last pipe is swedge fit, but I wonder why they cant put all the primarys on, weld the pipes where they come to a union between the 4 then slip on the collector and weld the outside, Im sure there is a good reason just one I am not picturing in my head, well usually things like that are done for a good reason anyway.


Sucks to hear about QTP not being helpful in your situation.

i like my qtp's also.

LMAO the whole thread was about complaints with QTP not a cheerfest for them.

My QTP's don't leak. Out of the thousands of people that have bought QTP's over the years, finding 5 threads complaining of leaking collectors don't mean this is some huge problem. Anytime you do high volume sales, you'll see complaints of some sort. There are complaints of every header brand buried in the archives of this site. QTP's will have more simply because of the law of averages - they sell very well, so there will be more complaints. It's a shame that people are so quick to post when they have a problem but rarely when they have a good experience. It really can give a product a bad wrap. JMO.

Yeah, I hear ya. The problem is if you have an issue with QTP yer on yer own. They won't stand behind their product. That is the point that's relevant, its not how many are good vs. how many are bad, doesn't matter if its one tenth of one percent when the company policy is to wash their hands of it when a problem arises - the end result is "Yer screwed!".

I know yer one satisfied QTP customer; you've barked yer horn/been in the tank for them for years. It’s the 10-20% of folks that get the bad quality parts from QTP that are left out in the cold - they don't feel as obliged towards the company as you do.
I'll bet yer gonna vote for Obama too...well you won't be able to return him either!