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Old 07-19-2018, 08:59 PM   #1
ed455
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Join Date: Jul 2003
Location: Port Charlotte, FL
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New to me Truck - exhaust question

I'm gonna have many questions over the next few weeks.
Here is the first.

1999 C3500 LS 7.4L Crew cab dually

Crawled up under and looked at the exhaust. Has true factory dual exhaust from manifolds back to a single muffler. Two catalytic converters also. Pipes appear to be 2.5" and the single muffler is enormous. But coming out of the muffler is a single exhaust to the back of the truck and it, too, appears to be 2.5".

This seems like a rather stupid setup. Dual 2.5" exhaust into a single muffler and SINGLE 2.5" pipe coming out. The truck is quiet as a Cadillac but I'm sure this is hurting power.

Am I missing something? Do most guys swap put that single muffler for dual mufflers and dual tail pipes? Or a new muffler with two in and two out?
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Old 07-20-2018, 07:55 AM   #2
95 S_Trucker
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Re: New to me Truck - exhaust question

This should be in the 88-98 section.

The tail pipe is 2 3/4"

Its plenty big enough for the 454. It makes power/torque down low. If it was a high rpm motor, it would be a different story.

If you want quiet exhaust keep it. If you want loud exhaust ditch it.
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-96 C3500 HD 7.4 NV4500 Rollback
-85 K10 5.7 700r4
-78 K10 5.7 4 Speed
-90 ZR1 5.7 6 Speed
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Old 07-20-2018, 09:19 AM   #3
ed455
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Re: New to me Truck - exhaust question

Quote:
Originally Posted by 95 S_Trucker View Post
This should be in the 88-98 section.

The tail pipe is 2 3/4"

Its plenty big enough for the 454. It makes power/torque down low. If it was a high rpm motor, it would be a different story.

If you want quiet exhaust keep it. If you want loud exhaust ditch it.
Thanks, but it's a 99 not a 98.
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Old 07-20-2018, 10:57 AM   #4
95 S_Trucker
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Re: New to me Truck - exhaust question

I know its a 99. I have one too.

The crew cab or the big block was the old style up to 2000.
__________________
-99 K2500 LS CCSB 7.4
-11 GMC 2500HD SLE CCSB 6.0
-96 C3500 HD 7.4 NV4500 Rollback
-85 K10 5.7 700r4
-78 K10 5.7 4 Speed
-90 ZR1 5.7 6 Speed
-62 Lincoln Sedan 430 Auto
-61 Lincoln Convertable 430 Auto


85 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=368864

78 Big10 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=383629

96 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=614515
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