Exhaust?

[Bart2500HD]

Here's the situation. I just bought my '01 2500HD 8.1L a couple weeks ago and while sitting on the ground installing some mudflaps, I noticed that the tailpipe has been bent forward to a point that it is kinked really bad at the bend just behind the axle. Now, I suppose I could just have a new tailpipe put on, but I also could use this as an excuse (Gee honey, the muffler was ruined too!) to put a better flowing muffler on it too. What do you all suggest as a good muffler for better performance and better flow, but not too loud? Or doesn't the 8.1L respond well to exhaust changes?

[snoman]

8.1's respond well to better flow. Flow master makes a dual in with a single 3.5 inch out that would play nicely on that truck.

[8100HD]

If your looking for a "quiet" aftermarket muffler go Magnaflow...I've got the Flowmaster and its loud around town, settles down on the highway,but you definetly know its there.

[Scyry]

I have a Gibson 2 in, 2 3.5 inch out cat back system on my 2001 6.0 Liter and it is really loud, too loud actually at anytime. I don't think Gibson makes anything but 2 in and 2 out for HD's so just so you know.

[LikeaRock14]

Well, HendyPhoto has the Flowmaster on his 8.1, he seems to love it. I'm still waiting on his sound clip/video... hehe

 

I havem't heard many 8.1's w/ exhaust, but I'd reccomend either a 50 Big Block or 70 series Flowmaster for Flows. Spin Tech seems to have hgad great reults w/ the Truck/RV muffler on the 8.1 trucks equipped w/ them. I'd reccomend this moreover than the Flows, since Spin Tech's have a lower level of interior resonance.

[awdvkd]

Seriously consider Magnaflows two in two out, it idles very quiet and is semi-loud under full throttle. It gets louder after awhile, my took about 6 mo and then leveled off and stayed there. I like it because it has a very low rumble, not loud.

[Bart2500HD]

My muffler shop said they can do a Magnaflow setup that has a dual in single 4" out. Would that give me too LITTLE backpressure?

[snoman]

With a 8.1 not too likely. Flow master makes a muffler with a 3.5 inch single outlet (two inlets) for sure and I believe a 4" one too

[Black02Silverado]

I have the big block 70 series on my 5.3 and it is quiet. You can hear some exhaust note but not that bad. You can always give Flowmaster a call and ask them what they would recommend.

['92Cheyenne]

flowmasters on my 8.1.

[awdvkd]

The Magnaflows fit better than the Flowmaster and you don't lose clearence. The FM sits Horizontally and the two in two out uses a lot less room. Looks like they belong there instead of an after thought or backwoods setup.

[THE BIGPUNN]

just got my flowmaster 50 two in , two out. hopefully having it installed tomarrow. i'll post how it turns out.