My current exhaust setup is custom long tube headers a magnaflow 12198 muffler swap with side exits. I have this setup an I feel like I am lossing torque.
I want a new exhaust setup that gives me a gain in torque. Exhaust gurus please help me choose my new exhaust.

 

Losing power with long tubes? What are you running, true duals or what?

 

I forgot! I eliminated the cats.

 

SI/DO exhaust

 

Hm, that's interesting, losing cats would lose back pressure which could lead to torque lost.

 

LTs, no cats, and a single exhaust is one of the best performing setups. You must be lacking power elsewhere. Your running a 3" intermediate pipe from the Y to the muffler correct? Your not running the 2.5" dual in 2.5" single out Y pipe? That would kill flow.

 

torque will be affected if your engine isnt running optimally..put ur cats back on.

 

put an F150 Online sticker on your back window, i hear these things really wake up your HP

 

 

Dont knock it till you've tried it 20015.4

 

Doh! I forgot that mod. jajajaja

No but seriously I want the sticker

 

Get you one!

 

This week end I will send the prepaid envalope to get my sticker.

 

When you say that the best setup is with a single exhaust, what tube diameter is the single exhaust?

I have the stock Y pipe with the stock 2.5 tubing running to the muffler.

I have been thinking about two different setups

Setup #1
-Dual 2.5" in Single 2.5" out Y pipe
-2.5" in 2.5" out SI/SO Magnaflow Muffler

Setup #2
-Dual 2.5" in Single 3.0" out Y pipe
-3.0" in 3.0" out SI/SO Magnaflow Muffler

Wich of the setups will give me more performance?

Thanks for all the replies

 

That right there is precisely your problem, its struggling to ex-hale. Using that stock 2.5" dual in, 2.5" single out Y pipe is killing so much energy, and the 2.5" intermediate pipe leading towards the muffler is too. You should definitely be running a 3" intermediate pipe in your exhaust, meaning 3" from the Y to the muffler, and get a better Y pipe.

Your options, you need Setup #2. Get 3" installed to the muffler ( in the middle of an exhaust, a smaller size leading to a larger size interupts flow and changes velocity pressure ) , and get a dual 2.5" in to single 3" out Y pipe connector ( Magnaflow Part #10778 ) or have your shop get creative and cut the stock Y pipe in half and mate a 3" end on it.

You could run dual outlets too, keep them 2.5", doesn't have to be 100% single, just upgrade to 3" and fix the Y pipe.