Debating true dual or y pipe set up

**pbguy357** · 12-13-2011, 10:13 AM

I'm debating doing a true dual exhaust system or just getting and making my own y pipe set up. Are their any strong upgrades have any people who have these different set ups? I was debating kooks for the exhaust system but not sure. I am defiantly getting headers, prob kooks again, which is why I was thinking about just going with their true dual system but 27 seems prices, or is that only because I need cats for emission purpose? Car is stock but slp lid. It is a m6 and any horse power difference from any users?
Anyone try the slp cats?

**matt evans** · 12-13-2011, 11:59 AM

true duals is the way to go but i have camaros and mine are dumped at the axle. We have a trans am in the shop were going to do the over the axle setup, but were trying to find an alternate to the Kooks setup. I have to say trans ams without the tips out the back look funny.

**pbguy357** · 12-13-2011, 03:43 PM

Will their be more of a hp gain with the true duals?

**bouigha123** · 12-13-2011, 03:54 PM

Yep, I want to get a set of tsp true duals with the sweet thunder mufflers they sound sweet and the price is great to boot.

**pajeff02** · 12-13-2011, 04:27 PM

I am totally happy with my Kooks LT's, catted Y and Magnaflow catback. The true dual setup is amazing, but a bit pricey. If you were building an all out motor with over the top horsepower goals I would say true dual. On a semi-stock motor with typical bolt ons, I am going to say that the overall difference between true dual and aftermarket mid-pipe would be minimal. You might gain a bit of power, but you are also probably adding 20 lbs. or so to the weight of your car.

**INMY01TA** · 12-13-2011, 05:23 PM

I vote Y pipe.

**silverz28camaro** · 12-13-2011, 06:12 PM

A good y-pipe will perform just as good or better then a dual setup, and weigh less...

http://www.ls1.com/forums/f63/how-ge...5/#post2727983

**matt evans** · 12-13-2011, 06:42 PM

If you have a good exhaust shop they can probably build you a system pretty cheap. Mine on both my cars is 3 in off the headers to the x-pipe and through glasspacks and it cost me 250 parts and labor. and on a side note i hooked my rear o2s back in and no check engine light or codes thrown. It works good as well that you wont have that rasp at 3k rpms ether.

**bouigha123** · 12-14-2011, 06:57 AM

As far as price goes duals can be had for very cheep. These prices are taken directly from TSP, Pacesetter coated long tubes $380 TSP true duals $460. They can also get crazy expensive these are taken from ws6store Kooks long tubes $870 and Kooks true duals $1526 assumeing you don't need cats ,have the panhard relocation kit, and drive shaft safety loop necessary. You can almost buy three sets of the TSP duals for what the Kooks cost.

**WS6SP33D** · 12-14-2011, 06:14 PM

I would vote y. I have had customers order and i install trues and i have fabed a few set to get a better fitment. Although a few people say true duals add ?hp over a y. we have dynoed before and after the install a few times and came up with a few gains and a few loses. Also with a y for the best results the intercept angle should be fabricated a little for a less force run in. We have seen all gains from this. Good luck with choice.

**TA98** · 12-14-2011, 06:28 PM

You could always get the Kooks true duals that exit out that back if you want to keep the complete exhaust look.

**ls1camino** · 12-15-2011, 06:12 AM

I would love to have a true dual setup on my car, but alas, ground clearnace is an issue, so I went with a custom setup. It tucks up really high and I'm lowered 3" in the front and 1" in the rear...never scrapped it.

I have Kooks LTs, running to a custom mandrel bent 3" y-pipe, merges with a Flowmaster merge to 4" single i-pipe, Spintech muffler, and dual 3" out the rear to quad 4" tips.

The flow difference between dual 3" and single 4" is only 1.57 square inches.

The main difference is the sound. It's much easier to hear a cam lope through true duals than it is through a y-pipe setup, but y-pipes can still sound good.

Here is a vid of the first startup of my 427 LS3 (ignore the valvetrain noise

):

**BrntWS6** · 12-18-2011, 04:20 PM

I always thought TD's made more power than a Y-pipe IF it didn't have a cutout. I do like the Kooks system and have heard it in person on a cammed car and it's pretty tame comared to my Kooks and GMMG H/C WS6 (both have cats). I was thinking about switching mainly for the sound. My setup sounds good and I get compliments at shows but it can get to be a little much on a 111 lsa

**knightryda01** · 12-19-2011, 04:48 AM

Ebay Headers + Magnaflow CB + mufflex 4 inch y-Pipe + No cats, Sounds Great!!! No Rasp!!! Cost me about $1300 all together.

**BrntWS6** · 01-01-2012, 09:14 AM

After much research I took the plunge and ordered the Kooks TD's with cat's and the single tips. It was either this or put money into my exising y-pipe to get a proper merge, and then I believe my GMMG is quite a restriction on a H/C/I car as it necks down to 2.0" or 2.5" over the axle. Price was a lot cheaper with a phone call, $1400 w/cats. I can make up for most of that cost selling my GMMG and Kooks y-pipe. Only thing is I have to wait 2-6 weeks for the single tips since they didn't have any in stock. I did find a shop that would custom make it close to me, but they were $400 more. This system is a good price for what you get.

**INMY01TA** · 01-01-2012, 09:28 AM

I think people make too much hoopla about the merge in their y pipe to gain 1/2 a horspower.

**BrntWS6** · 01-01-2012, 10:31 AM

Pat G has back to back dynos with 10-15hp gain in the midrange with a proper merge.

**INMY01TA** · 01-01-2012, 10:41 AM

Forgive me if I call BS. Maybe against the absolte worst one out there with flashing all inside of it.

**BrntWS6** · 01-01-2012, 12:10 PM

I believe it was with the QTP y-pipe. 10rwtq from 2500 - 4000 rpm....I've never seen a y-pipe with flashing inside of it. There's a pretty long thread on tech about it.