Right after the Y pipe. The Troyer kit should include a dual inlet 2.5" to single outlet 3" Y pipe. Run a 3" intermediate pipe to a 3" inlet muffler, and 2.5" tailpipes, you will be set.

 

Thanks for all your advice and comments. I just ordered a custom package from Troyer with the Dynatech Header System. I can't wait!

 

The chick at Troyer's said that the Y was 2.5". Not sure if she was just talking about the inlets. I haven't been able to find any specifications anywhere online. So is it possible that it's 2.5" in and out? If so, what would be the advantages and disadvantages of 2.5" pipe vs. 3" pipe to the muffler? Keep in mind I want it to sound great, but I want the best performance gain.

 

3" out the Y to the muffler is a better size to run for higher velocity aiding in better low end power, and especially with Longtubes you will want the free breathing of 3" to the muffler.

 

I got confirmation today from Troyer, confirmed by Dynatech, that the Y outlet is 2.5". I would hate to cut into it, considering how damn expensive it is. And a different Y with a 3" outlet would be another $70 - 80 or so. I'm trying to figure out if it would be worth it to change it to 3" to the muffler or leave it 2.5".

 

It would be better to run 3" from the Y to the muffler. Its 2.5" probably because its listed to fit directly in, even to an OEM cat-back ( but an OEM cat-back would not last with that kit )

 

I have a 02 F150 Boss. I had a custom exhaust shop in town remove all my stock cats, make a custom down pipe with two hi flow cats, and finish the rest of the exhaust with 2 1/2" piping. It is also a true dual exhaust. Currently I have $650 into the system minus the header. Still trying to decide on that. I immediately noticed the torque difference as soon as I drove the truck.

 

I have a lot of time to kill waiting to come back home from Iraq, so I sit and spend way too much time surfing the web. Lately, the STS turbo kit has caught my attention. I have already ordered the Dynatech headers, which would be a waste on a turbocharged engine. (according to the STS website FAQs) I could sell the header kit to my buddy who has a King Ranch, if I could talk him into it. I need someone to talk me out of it, because I am tempted.

 

Don't do it. On these trucks a positive displacement blower would be the way to go. Gobs of low end torque, you get to keep you headers, and it sounds cool as hell......not sure if that was the talking out of you wanted, but I would (have done) do.

 

I thought Troyer could/would stretch the outlet to 3 inches if requested, saw a write up somewhere about a dynatech install at his shop and they stretched it out to 3".

 

Yeah, I've decided not to do that. Sometimes I get in these crazy modes when I see something and have to have it, and I spend spend spend, until I realize that I shouldn't have. Maybe next deployment I'll think about a blower.

I didn't know they would do that or I would have asked. I would be curious to know if they would stretch it, then ship it, as I will be doing it myself, not having it done in his shop. Would stretching it cause it to be weaker since it would be thinner and eventually break through? I know most muffler shops have pipe stretchers too.

 

Not a real big issue since its t-304 stainless.