5.3l LT headers and Y pipe

[2014MallCrawler]

THY-352Y-L-C found it.

[CAtaylor]

I couldn't find them on their website either. Autoanything shows they do exist though.

[66nova]

Thorleys website sucks. I love my headers, but hate the website.

[draino]

I'm trying to figure out what the y-pipe situation is with the Doug thorley tri-y's.

[CAtaylor]

I'm trying to figure out what the y-pipe situation is with the Doug thorley tri-y's.

From what I can find. No cats and passenger exit. Waiting on more info.

[draino]

From what I can find. No cats and passenger exit. Waiting on more info.

Keep us posted. Wondering if a set of cats could be squeezed in the y-pipe.

[66nova]

Keep us posted. Wondering if a set of cats could be squeezed in the y-pipe.

Yes a small set like magnaflow will fit.

[Jennabear]

1 3/4" primary, 2 1/2" collector, no cats, should mate to factory/aftermarket catback exhaust, replaces factory y pipe.

[Jennabear]

Keep us posted. Wondering if a set of cats could be squeezed in the y-pipe.

Would require some custom welding, but certainly plenty of room.

[draino]

Would the new 5.3's respond better with the 1 3/4 or 1 7/8 primaries for overall performance.

[Jennabear]

1 3/4" due to the physics of the airflow.

[66nova]

Would the new 5.3's respond better with the 1 3/4 or 1 7/8 primaries for overall performance.

1 3/4 unless you're planning on a bunch of supporting mods.

[66nova]

Would require some custom welding, but certainly plenty of room.

You sell Magnaflow cats also, correct?

[Jennabear]

That we do.

[2014MallCrawler]

1 3/4" due to the physics of the airflow.

 

Totally agree with you!