LT1-LT4 Modifications 1993-97 Gen II Small Block V8

stock exhuast size??

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Old 03-08-2010, 04:05 PM
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Default stock exhuast size??

whats the stock exhaust size? i was thinking of cutting off my cat and muffler and replacing both with glasspacks.
Old 03-08-2010, 04:41 PM
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I was told by a shop its 2.5 from the cat to the muffler and 2.25 out of the muffler to the tailpipes. i thought it was 2.75 in and 2.5 out so i bought a 3 in muffler and 2.75 out knowing they'd have to downsize it a bit. they ended up having to downsize it a bit more than i thought. it still looks good but here's a comparison for you with my 3 in 2.75 out muffler vs the stock piping.





Old 03-08-2010, 05:37 PM
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The intermediate piping on stock exhaust is 2.75".
Old 03-08-2010, 05:45 PM
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Originally Posted by RamAir95TA
The intermediate piping on stock exhaust is 2.75".
so does that mean the shop was wrong and i did get the correct muffler? (i got the 12267 magnaflow)
Old 03-08-2010, 05:53 PM
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No idea...but when I took off my stock exhaust and measured the ID of the intermediate pipe, it was 2.75".

Out of curiosity, why didn't you install a full cat-back instead of just a muffler?
Old 03-08-2010, 05:56 PM
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because i got a really good deal on the muffler ($86 shipped new) and only paid $70 to have it welded in. I also did not like the magnaflow catback's large truck tips so i wanted to keep my stock quad tips. Since my car is pretty much stock i didn't feel the need to spend $400 + install for a 3" catback.
Old 03-08-2010, 06:00 PM
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k so what do you guys think about this? cut off my cat and replace the cat with a glasspack and keep the magnaflow on?? or cut off the cat and replace the cat with a glasspack and replace the magnaflow also with a glasspack???
Old 03-08-2010, 07:30 PM
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cut the cat and replace with a stright pipe, putting a glaspack in its place is useless lol. and id keep the magnaflow muffler. its better than a glasspack and will last alot longer
Old 03-08-2010, 07:52 PM
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but wont the glasspack replacing the cat help cut of the rasp and crackle??
Old 03-08-2010, 07:56 PM
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the muffler will, i had a flowmaster 40 series and a i pipe inplace of the cat and had no crackle or pop except when cold at a high rpm. the muffler change help much more than the cat removel. id think putting a glasspack would cause a noise esp when it blows out in a week lol.



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