I have a Chevy 350 with an edelbrock carb/intake, and ebay block hugger headers. Right now it dumps out into a 2" flange, straight to the ground. I am going to run a pipe from each header 90 degrees, to a glasspack, and then a short piece of tail pipe that will exit right through the bedside.

Question is, what size glasspack do I want? (please, no bashing glasspacks, I know how they sound) I don't want it to be raspy. Id rather it be deep. So I think I want a longer one. Pep Boys down the street has 2", 2.25", and 2.5" pipe diameters and about 30" lengths. Hopefully it wont be TOO quiet, as I do want a powerfull sound.

Anyways, what size pipes should I get? 2.5" is generally the size most people use with a mild V8 right? But since the pipe coming off my headers is 2", would it hurt to go with 2"? Or should I put an adapter on it and get 2.5" pipes? It wont be very long at all, just from the headers right out the bed side behind the cab.

I would say 2 1/4" pipe. That's what I used on all the small blocks I've owned and it had plenty of power. Since the motor is basically stock internally (assuming) you really don't need anything bigger. I ran flowmaster 40 series and it had a nice rumble but when you got on it, it sounded mean. As for glasspack length, I would say at least 18" if not 24". I personally don't care for them but to each their own. Hope this helps some.

If you put a few bends in after the glasspack it won't be all that bad. Even a turndown right off of the glass pack kills a lot of the noise that you don't like. Even a turbo muffler is just as cheap and will help you there too.

I had glasspacks on mine with turndowns about a foot after the glasspack. Mild built 350.

Here is a link a video of it if you care to listen. Its rather windy, but it doesn't have that glasspack sound if you ask me, well not too much anyway.

http://s268.photobucket.com/albums/jj21/jenx21/?action=view&current=video.flv

later
jenks

Glasspacks sound like shit. IMHO....

The longer the length of the muffler, the less like shit it will sound.

If your header collectors are 2 inch, just get 2 inch pipes, no point in getting adapters or paying the extra money. The most flow the pipe is going to have is through that 2 inch collector.

If your header collectors are 2 inch, just get 2 inch pipes, no point in getting adapters or paying the extra money. The most flow the pipe is going to have is through that 2 inch collector.


Thanks for the advice. That's what I was looking to hear :D

Glasspacks sound like shit. IMHO....

The longer the length of the muffler, the less like shit it will sound.

If your header collectors are 2 inch, just get 2 inch pipes, no point in getting adapters or paying the extra money. The most flow the pipe is going to have is through that 2 inch collector.

x2, anything larger will not affect flow. spend a bit for "turbo" or
flowmaster mufflers. you might also make friends at a small
muffler shop. the one near me sometimes take off relatively
new performance mufflers, and might give or sell cheap.
( never hurts to have a friend at a muffler shop.

I guess I shouldn't rag on the glass packs as much as I did, they are cheap and affordable.

thats a plus.

The fit easily into tight spaces. Another plus.

I guess that I am not so much about the "loud annoying" sound as I am about quality sound.

And after making a 1000 miles plus cross country trip 4 years ago with a big block screaming through Flowmaster 40 series mufflers the whole trip, I probably will find something a little more quiet for a future muffler.