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fairplay
10-19-2006, 10:41 AM
Hey guys, I have a clogged cat problem on my '85 CV, and want to do I dual exhaust conversion while I'm taking care of it. What do I need to do this? Obviously an H-pipe, mufflers, and cats, but what else, and what sizes? Any suggestions for good mufflers are appreciated, as I know nothing about them, and am looking for a low, subtle sound that's not loud, but not TOO quiet. Are clamps kosher, or is welding a "must"?

More importantly, though, does anyone know what PA's emissions tests laws are? Do all vehicles get emissions tests, or is there a cut off where if you don't drive a certain number of miles, they don't make you get one? I thought I heard something like that, but I wanted to check, as a few of you guys are from PA.

Thanks in advance.

-Tommy

Blaze86Vic
10-19-2006, 11:11 AM
Pretty much every state has a special pupose/classic car registration with a mileage restriction. But what you want is 2-1/4" exhaust, with DynoMax SuperTurbo muflers, and high flow cats. This will keep you street legal, and maintain and almost stock sound as well. Adjust muffler type for different sound but with cats don't plan on ever being really loud. If you decided to go cat free then it will get significantly louder.

mrltd
10-19-2006, 01:41 PM
Pa's emmissions laws vary by county.

88Vic
10-19-2006, 04:36 PM
Glasspacks are pretty loud. And if you go with a Mustang exhaust, it's 2.5".

mrltd
10-19-2006, 04:42 PM
Glasspacks are pretty loud. And if you go with a Mustang exhaust, it's 2.5".

Stock (and some aftermarket) mustang exhaust is 2.25" 2.25 is all that's needed for most vic applications.

GoodSamaritan
10-19-2006, 04:44 PM
I have some 4ft long glasspacks on my wagon. It is noticable but not annoying. Sounds better than it has a right to. I have been complimented on it more than once.

Lincolnmania
10-19-2006, 05:42 PM
Hey guys, I have a clogged cat problem on my '85 CV, and want to do I dual exhaust conversion while I'm taking care of it. What do I need to do this? Obviously an H-pipe, mufflers, and cats, but what else, and what sizes? Any suggestions for good mufflers are appreciated, as I know nothing about them, and am looking for a low, subtle sound that's not loud, but not TOO quiet. Are clamps kosher, or is welding a "must"?

More importantly, though, does anyone know what PA's emissions tests laws are? Do all vehicles get emissions tests, or is there a cut off where if you don't drive a certain number of miles, they don't make you get one? I thought I heard something like that, but I wanted to check, as a few of you guys are from PA.

Thanks in advance.

-Tommy

tommy
i do believe you guys get the dyno test in allentown, so you are going to need cats to pass the emmisions test........if you drive under 5,000 mi a year you get an emmisions exempt sticker, but most shops will still check to see if all the emmisions equipment is still there
i reccomend a set of stock shorty headers on that lopo motor, a catted h pipe for a mustang or a mark7, some 2.5" ofset ofset mufflers, a pr of impala ss 2.5" tailpipes, a pr of mustang midpipes, 4 12" pieces of 2.5" exhaust, two turndowns, clamps and hangers.............you can also do the stock box duals with 90 towncar headers, or the 2.25" midpipes with stock 2" tails.......have done them a bunch of ways.........i'm me sometime i can give you more details........i just finished nicks grand marquis last wk, pics up in scotts automotive, we used a pr of used 2.25" tails with chrome tips on his car.......he lives in bethlehem, maybe you can catch up with him sometime........come to my shop sometime mang! would love to meet you, i'm a little over an hr away from you
scott

DuceAnAHalf
10-19-2006, 07:39 PM
hey Scott, what year Impalla SS tail pipes? like 95 or so? I might put tails on my car. Only because i want to put on flame throwers.

Good welding will ensure a leak-free system, but a fully welded exhaust is a bitch because you cant just unbolt your mufflers, you have to drop the whole system.

mrltd
10-19-2006, 07:41 PM
yes...the late model RWD 94-96 Impala

DuceAnAHalf
10-19-2006, 07:42 PM
yes...the late model RWD 94-96 Impala
Thats what i thought, but i did not remember ever seeing a year on the application.

91LTDProject
10-19-2006, 08:00 PM
I would personally go with Flowmaster 40 series

gadget73
10-20-2006, 12:35 AM
meh, flowmasters. They sound OK and all but they have a hollow tinny sound and have a tendency to backfire and rumble a bit more than I personally care for. The Thrush turbos aren't obnoxious and are pretty cheap, Dynomax SuperTurbos are also nice. Summit mufflers are real cheap but mine are pretty darn quiet. Sounds just about stock noise level.

boXman
10-20-2006, 02:57 AM
I like the pro force mufflers on Nick's car...sounds reall good!

DuceAnAHalf
10-20-2006, 08:03 AM
meh, flowmasters. They sound OK and all but they have a hollow tinny sound and have a tendency to backfire and rumble a bit more than I personally care for. The Thrush turbos aren't obnoxious and are pretty cheap, Dynomax SuperTurbos are also nice. Summit mufflers are real cheap but mine are pretty darn quiet. Sounds just about stock noise level.
i went form 40s to 50's and it got rid of the hollow sound. a little more muffled, but still sounds good.

fairplay
10-20-2006, 10:49 AM
Awesome, I think I'm going with a slightly modded version of scott's suggestion, or something very much like it. Thanks guys.

Scott, I'll IM you sometime, mang. Thanks again.

91 LTD
10-21-2006, 06:18 AM
Why an H pipe and not an X?

AOD
10-24-2006, 09:01 AM
Why would he need an X pipe? It costs more money and unless you're pumping out high HP numbers, you won't see a difference when using an H-pipe.

mrltd
10-24-2006, 09:32 PM
Why an H pipe and not an X?

Cheaper, and not much of a difference at low HP levels.