klricks

You may need pay some $ to the court on your exhaust even with the glasspacks.

http://www.pca.state.mn.us/index.php..._view/gid,2172

See pages 26-28

mustangGT90210

Ok, OP, how long have the glass packs been on your truck? Me and a buddy put a 24 inch glass pack on his 4.3 Silverado probably 4 months ago, and that truck is still getting louder.

dr_bowtie

glass packs are more restrictive than a regular muffler...so just take it off...

Lights McGee

I dont know who told you that but they are dead wrong, a glass pack is basically a straight pipe wrapped in fiberglass, so when the air flutes through it the fiberglass gives it a rumble, it does nothing to slow down the exhaust like a stock muffler would.

As to how to break it in, run your truck for awhile give it some gas and let it get warm, then dump ice cold water on it while its still hot, this will break up the fiberglass and make it louder

93F-150

if you want to get your glasspacks louder pour gas in them and get going about 55-60mph then shut your truck off while your still going 55 and in gear. you will hear a bang. and your glasspacks will be burned out and as loud as they can get. trust me it works my dad did it on his.

sylver91

Or give it to this guy... He'll do it for you

david_seward

Ok I've always put the glasspack close to the bhottest p?art of the exhaust to heat them so they break on there own or use a torck get them nice and hot and smac@k it with a hammer or use cold water I've gotten mine super hot and back down a boat ramp into thbe water before

dr_bowtie

Really?????? you care to bet on that... I have YEARS of Dyno experience that proves otherwise...

the flutes cause Turbulance which aids in Reversion which impedes flow... even though you can see straight through it it IS more restrictive than a walker Turbo Muffler...

Lights McGee

Ok, I did not know about the flutes turbulance, and definatley agree about proformance mufflers, because they do just that preform, but I read your first post like stock mufflers are better, and I just can't beleive a stock muffler would be better then a glasspack, but then,again I'm not a mechanic, and it wouldn't be the first time I was wrong

dr_bowtie

in some cases the stock muffler is better flowing....just not the stock muffler on the 300-6... mine was the big long round one and it SUCKED....