Thread: glasspack longer the better?

ive seen tons of ppl talk about these and how they replace there res with one of these. so whats best? the longest the shortest or in between? and everyone gets the 2 1/4 inlet and outlet right?

idk how the hell this ended up here i thought i was in the general tech discussion. SORRY. someone please move

Thanks for the replies guys and the thorough one scotty. I have stock catback. So ill probably need to take it in. I can weld but don't have access to one.

Originally Posted by Scottydoggs

what i did was measure the res that was in my car, it came out to 28 inches long, flange to to the end of the outlet tube. stock outlet is 2.25 inside diameter.

i picked up a 32 inch glass pack cut the inlet tube off one side, and welded a flange on it. made it roughly 29 1/2 inches long. it cost 22, the flange cost 10, the welder got me for 20, new gasket was 6. vs a new replacement walker res for 100 or more locally.

my car already had the stock cat back replaced so all my pipes and stuff are clamped not factory welded.

if you have the stock cat back your going to need to go to a muffler shop, have the old res cut out and the glass pack welded in, unless you can weld yourself.







if your cat back is not stock, un bolt it yeah right, break the bolts from the cat to the res and drop the whole exhaust and then work on getting the res off the pipe. i used a cut off wheel and scored the outlet tube with 3 lines and just pealed the pipe back till it came off.

Scotty hope you don't mind me digging this up. Your detailed post ALMOST answered all my ?'s
Do you have a part # for the glasspack you picked up or brand? What was the inner diameter of the gp you went with, 2.25 or 2.5? Guessing 2.5 would require modification to fit?

Aha nice, I hope mine stays red rather than rusts.
Thanks for info. Yea I got a stock catback. Almost certainly just going to take it to a shop to have the res cutout and GP welded in, if I do it my car will prolly be laid up for days... First shop I called quoted $60, not too bad.
Why did you install a new intermediate pipe? And what exactly are you refering to here... the link between res/gp and the cross pipe? Did you upgrade the inner diameter or ... ?? Do you think I should have the shop replaced this while theyre at it? My car is an '01 with 160k, it may have to be replaced anyways idk.

And this thread should be stickied or linked to in the exhaust sticky, very helpful for deciding on glasspack vs stock res.

Y-pipe... thats the name. I don't think mine will be that bad, I believe this is the car's 4rth or 5th salty winter. Yea $60 if I bring in the GP ($24 on amazon) and have them install it. I do still have the U-bend but got a DP ready to install as well so that'll be taken care of.

One more silly question, what size are the bolts between DP and cat-back flange? Mine are literally rusted twigs, I have no reference. Are the manifold-dp bolts the same ones?

Originally Posted by Scottydoggs

ive yet to deal with the DP never touched those bolts. the other two just get a pair of bolts 1 1/2 inches long a 1/4 inch wide threads and a fat washer for both sides.

got that at the hardware store for like 2 bucks or less.

thinking out loud, you should maybe get the dp installed at the same time. this way they can weld it all up, or they will need to install a flange on the glass pack so it fits like stock.

i kinda like the idea of having the bolt up flanges myself so the cat back can be dropped easily if need be.

Yea I'd rather it all be flanged and bolted. Thinking I'm gonna install the DP myself to my stock cat-back with it's completely destroyed resonator then take it to the shop with a GP in hand.
Did you reinstall the heat shield aka piece of sheet metal above the glasspack? My res has a piece of sheet metal tacked on to separate it from the floor panels. Just wanna avoid cooking the hell out of the floor, cause its in nearly perfect shape atm, almost zero rust amazingly.

Gonna call around anyways and see what they'll charge me for DP install. THe more I think about it, the more I second guess wanting to lay on the freezing cold garage floor and fight with 13 years of rust...ahah. Might be worth another $40 to have it done on a lift and save myself the swearing.

Anyways, thanks for the info, appreciate it.

Originally Posted by Scottydoggs

no problem. i know what its like to hear all that leaking, it sucks.

its so nice now that the whole cat back is all new parts. its so silent now. all i hear is blower whine.

YEa its driving me CRAZY. There's about a 10" section on top of the res that's completely rusted and gone. I think all this salt on the roads accelerated its downfall. Between the drone and interior trim rattling, makes me wanna put it in a ditch lol.
I'm jealous....and excited to get mine fixed.