QTP/KOOKS Question
Thread Starter
12 Second Club
Joined: Dec 2005
Posts: 207
Likes: 0
From: NJ
QTP/KOOKS Question Hey guys, I can use a little help. I've already searched the site for a long time and have been through all the exhaust posts. I'm looking at LTs and I've narrowed my choices down to QTP and KOOKS. I know that they are the same and I should get which ever is cheaper, but what I'm concerned with are the catted y-pipes. I really like the merge on the QTP Y and I was wondering if kooks was the same, and if not would there be any noticeable difference in gains/flow? Also, are there any differences between the Y's with clearance? Last question about the Y's. Kooks Y comes with o2 bungs welded in for the rear o2s, so I would just get extensions and reuse the rear o2s right? And does QTPs y have these? Just for the record, I'm going to be ditching the egr/air.
Please help a guy out lol. Should I go QTP LTs & QTP catted y or Kooks LTs & Kooks catted y or QTP LTs with kooks catted y or vise versa Please help Need input
A little more info on my car:
2000 Z28 A4 - SLP LM, Lid, filter, bellows, CAI, STB, UMI sfcs, c/s rotors, ss brake lines.
Please help a guy out lol. Should I go QTP LTs & QTP catted y or Kooks LTs & Kooks catted y or QTP LTs with kooks catted y or vise versa Please help Need input
A little more info on my car:
2000 Z28 A4 - SLP LM, Lid, filter, bellows, CAI, STB, UMI sfcs, c/s rotors, ss brake lines.
TECH Enthusiast
Joined: Aug 2002
Posts: 521
Likes: 0
From: Los Angeles
Kooks will charge extra if you want a merge collector. The QTPs are probably the best deal in Grott style header right now. As for the Y pipe, some have said that they have problems installing the QTP catted Y. However, the problem can be eliminated if you have a custom Y pipe made. It will also be cheaper if you have a custom Y pipe made by a shop.
Thread Starter
12 Second Club
Joined: Dec 2005
Posts: 207
Likes: 0
From: NJ
Thanks for the info. I'd rather stay away from getting a custom y. A few of my buddies with LS1s had it done and they ended up getting worse clearance / fitment issues than they would have if they went with the Y for their LTs. So how would QTP LTs w/o emissions & Kooks catted y setup sound to you guys? The only reason I would go with the QTP LTs over the Kooks LTs right now is b/c they are about $100 cheaper. Or should I just pay the $100 more and go all kooks?
the 4 piece design of the qtps takes alittle trial and error when test fitting but you should be able to get decent clearance plus the hvmc is a bonus with the qtps so i'd say go qtp.
Trending Topics
TECH Resident
iTrader: (1)
Joined: May 2004
Posts: 848
Likes: 0
From: Tree-Hugging, Bug eating CALI'
I would recommend the QTPs.
As a reference, I know a guy, with an 02 Z M6. He has the Kooks, and their cat'd y-pipe, with a B&B catback. After a tune, he put down like 347 RWHP, and around 36X RWTQ. With the standard QTPs, their cat' d y-pipe, and their cats', after a tune, through a Borla catback, my car put down 354/360 RWHP/RWTQ. Some of that may be due to the QTEC open, in the Borla flange, but, I bet some of that is in the y-pipe.
I just upgraded to QTPs HVMCs, and love them. I haven' t dyno' d them yet, but, once I get a little more $$$, I am gonna. I have changed to some different cat' s though, and changed the y-pipe a little, and hope to be able to pull a little more power out. The PITA on the QTP y-pipe, for me, was where the pipe went under the floor crossmemeber, just past the collector. In order to have enough clearance, for that, I had to pull the cat down, on the driver' s side. The most clearance I can get with this setup was about 3.5".
Just drive carefully, and you will be okay.
As a reference, I know a guy, with an 02 Z M6. He has the Kooks, and their cat'd y-pipe, with a B&B catback. After a tune, he put down like 347 RWHP, and around 36X RWTQ. With the standard QTPs, their cat' d y-pipe, and their cats', after a tune, through a Borla catback, my car put down 354/360 RWHP/RWTQ. Some of that may be due to the QTEC open, in the Borla flange, but, I bet some of that is in the y-pipe.
I just upgraded to QTPs HVMCs, and love them. I haven' t dyno' d them yet, but, once I get a little more $$$, I am gonna. I have changed to some different cat' s though, and changed the y-pipe a little, and hope to be able to pull a little more power out. The PITA on the QTP y-pipe, for me, was where the pipe went under the floor crossmemeber, just past the collector. In order to have enough clearance, for that, I had to pull the cat down, on the driver' s side. The most clearance I can get with this setup was about 3.5".
Just drive carefully, and you will be okay.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
I have the Kooks LT and catted Y. Love them both, easy installation and I dont have any ground clearence problems and I lowered the car (see signature). I dont have the numbers to say I have more HP but I would bet that both are equal. I would make price be your deciding factor on choosing. Both are great exhaust for these cars. Let us see what you decided on when you get them in!
