Muffler type restriction hierarchy

Thought something like that would be useful after I read CGLockRacer's post. Does this look right? (from least to most restrictive)

• Nothing

• Straight Pipe

• Perforated tube straight-through glasspack

• Louvered tube straight-through glasspack

• Auger-style

• Straight-through chambered

• "Turbo" style (offset perforated tubes + baffles, sometimes with glasspack section)

• Supertrapp on full quiet setting

• Full Case (factory-style baffled multiple chambers, sometimes with glasspack section)

You forget an actual turbocharger for an exhaust system.

Restrictive how?

In reply to MrJoshua:

Probably in terms of backpressure......you want restrictive, I'll snap a pick of a sho's factory y-pipe. You'll understand why we gain 10+whp by going catless.

Somewhere below full case should be "a supertrapp set up to be quiet".

GameboyRMH wrote: - Louvered tube straight-through glasspack

OK, stupid question time. Are the louvers supposed to "scoop" the flow, or not?

bluej wrote:

GameboyRMH wrote: - Louvered tube straight-through glasspack

OK, stupid question time. Are the louvers supposed to "scoop" the flow, or not?

Not a dumb question since either could work...but yes.

Not sure, but this link may help - look at the last post:

http://ls1tech.com/forums/conversions-hybrids/1189808-quiet-high-flow-mufflers.html

Good article reproduction from car craft, too.

http://67-72chevytrucks.com/vboard/showthread.php?t=263014

Well the first thing I see in that chart is that Hooker Maxflows apparently kick ass...not expensive either and they have a cool angular shape.

JMO here, louvered glasspacks are junk. I'd put on restrictive OEM mufflers then them. The idea has merit, but the execution stinks.

Also, I would throw out the idea that it depends on intended application for the order.

I've heard they're junk in terms of longevity, the packing blows out of them easily.

Packing blows out, thus "straight pipe." At least you could fain legality when you get pulled over. "But officer, its got mufflers. See?"

Appleseed wrote: Packing blows out, thus "straight pipe." At least you could fain legality when you get pulled over. "But officer, its got mufflers. See?"

I once ran across a video on YouTube with a guy showing you how to make a "street legal straight pipe"...he stuck a straight pipe through a bullet muffler and welded them together.

That's why sometimes they have a rod or wire they can run up the pipe. If it goes through, your stung for running a straight pipe.

If your doing this, dong forget to compliment every harley you see running straight pipes and having a loud pipes save lives sticker.

That's only relevant if you throw revs at very stop.

Where would an old-school chambered exhaust (not muffler) fall on that list?

Smitthy? I remember a discussion on the HAMB a few years ago. Not sure were they fall though.

In reply to Appleseed:

Smithy's

Nicer, deeper sound than glasspacks. They're perforated inside with a steel packing.

I've used them on a few of my cars and customer cars over the years.

Longer ones sound deeper than shorter ones.

If you want to be billy badass with your pompadour and pack of smokes rolled up in your sleeve, call them "Smittys"