Need advice/testimonials

I am trying to plan my exhaust setup, and I am heavily considering the Dynatech long tube header system with high flow cats. Its hard to justify the cost because that seems really expensive to me, but all the reviews I've seen have been good. I want the performance gain as well as the sound difference. I love that deep muscle sound. I'm also a longtime fan of true duals. I've did some research on the use of an x-pipe, which seems to be a necessity.


So my questions:

With the Dynatech header system, would installing an X-pipe in the place of the Y-pipe cause a loss of power, like on the low end, or what differences would result?

If I were to use an X-pipe and run dual Magnaflow 14" rounds, how would that sound and perform?


Thanks for any comments.

 

X pipe will take away a little low end torque like the headers will, but the overall HP/TQ gain would be very worth it. If you go xpipe stay 2.5" exhaust so run dual 2.5" header back pipe.

I run dual 14" magnaflow mufflers and will stay with them. Not to loud until WOT and sounds good.

 

Wrong. The X pipe will help properly balance both banks to level out a proper scavenging pressure to aid in increasing low end power. And 2.5" pipes will kill the low end energy and only help in the WOT areas, or on highly modified engines such as a supercharged, or nitrous oxide boosted engine.

 

dont argue with darren over exhaust..he gets butt hurt.

 

So, in other words, I'd be much better off keeping the Y that comes with the dynatech header system and doing a SIDO muffler? Considering my engine is not heavily modified. I am planning on going with a package from Troyer including custom tuning, the Dynatech headers, Airaid intake, dual electric fans, and underdrive pullys. Those are only minor modifications in my opinion. I've been looking at all the guys that say they are running true duals, and even though I love the idea, I think Darren is making a lot of sense and speaking the truth. I wonder if all those guys are sacrificing power. Although I want a kicka$$ sounding exhaust, I don't want to sacrifice any power. I would go with performance over sound to a certain extent. And as for WOT, I want to stay off the pedal as much as possible considering gas usage.

 

What is butt hurt?

 

its but hurt only hurts more than normal lol

 

how much are they charging you for the exhaust system

 

Exactly. I noticed the loss immediatley after having mine done, the increase from removing the rear cats and custom tunes has made up for it though and I would say I am around where the truck was all stock which was nice, but if i had a single 3" exhaust I can only imagine the low end power of it now.

I dont tow alot, and i do alot of mixed highway & city driving, so i decided on true duals. I must say it is very sweet to hear that 'Harley rumble' when driving by, the tone of an actual dual exhaust is sweet.

 

I'm waiting on a quote from Troyer on the package I want including the header/cat system. Their site lists it individually for $1395. I can't believe I'm even considering spending that much money on it.

As for the rest of the system, I might wait and find the muffler and tips I want for the cheapest, maybe on eBay, then take it to a muffler shop since I want it welded in. No clamps for me. So total, headers to tips, I'm estimating around $1700.

Does anyone know of another way? Dynatech are said to be the best available, and they are bolt-on, including bungs for the factory O2 sensors. If I could find the components individually, I could piece it together myself. I can weld, but I don't have a welder. Nor do I have a pipe bender.

 

The header and y-pipe are sold separately, if you wanted to fab your own y-pipe. But by the time you get hi-flow cats and someone to bend and weld the pipes, I don't think you'll have saved much. If you're getting your parts from Troyer, I'd ask him what cat back he thinks would work best with his tune.

 

That's what I figured. The Dynatech is complete up to the Y pipe, and it's basicly a direct replacement using the factory O2 sensors and EGR.

I don't really like the idea of a catback system, because they are more expensive and I want it welded, no clamps. I want dual out exiting behind the rear tires, not 45ed, 90 degrees. So far, I haven't seen anything exactly like what I want. I'm thinking of going with a 14" Magnaflow SIDO, like part # 12158.

 

Then have a shop fab your system with a 3" intermediate pipe and the Magnaflow muffler anf tips of your choice.

 

Where would you transition to 3"? At the Y or the muffler, or in the middle? And then dual 2.5" out?

 

I was under the impression that by increasing the diameter of the exhaust pipe you decreased back pressure and lowered your torque in the low end. My butt dyno seemed to verify this on my old truck. It had the 4.6 and 3.08 which was AWFUL, and I changed the factory exhaust to a SISO cat back 3" JBA setup.
While the low end felt a bit robbed of power, the mid range was fantastic! In fact 40 to 70 times went down by a solid .5 seconds according to the stop watch. WOT at freeway speeds gave me straight line acceleration to the speed limit and had no problem hanging with the stock 5.4. I have read that by keeping the factory diameter, installing maggies and an X pipe could actually increase the low end a bit.....
Any thoughts people?