Author Topic: Exhaust Upgrade  (Read 2958 times)

Offline 197

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Exhaust Upgrade
« on: September 09, 2007, 10:52:39 PM »
Im going to be upgrading my exhaust on my 73 C20 Cheyenne Super rocking the 454 ;D. But anyways its got 2 1/4 inch pipe on it. Im pretty set on getting 3inch duals. Will I be gaining any performance out of this upgrade. And should I go out the back or side?

Ill post pics of the whole truck after I get my exhaust.
'73 C20 454

Offline loudnlow87

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Re: Exhaust Upgrade
« Reply #1 on: September 09, 2007, 11:21:12 PM »
small pipes= tq on the low end
bigger pipes=hp on the top end.

def go out the side, in front of the wheels. thats what i did and it looks sick.

stock really sucks

Offline VileZambonie

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Re: Exhaust Upgrade
« Reply #2 on: September 10, 2007, 08:34:50 AM »
Exhaust looks much better after the rear axle IMO and pointed to the side. 3" with a 454 is just right
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Offline Captkaos

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Re: Exhaust Upgrade
« Reply #3 on: September 10, 2007, 09:16:05 AM »
I had then turned in front of the wheels for a while and it just didn't look right and was really loud even with super turbos.  I would run it out the back past the axle and turn it out the sides.

Offline 1973c20

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Re: Exhaust Upgrade
« Reply #4 on: September 10, 2007, 12:53:06 PM »
hey 197, i have the exact same truck as you lol except the previous owners of mine swapped in a 350 for the 454 because the 454 was having major issues. right now it has a 2 into 1 crossover with single glasspack, its nice and loud but im gonna eventually upgrade to a 2.25 inch true dual exhaust with glasspacks that exit in front of the rear tires. of course to each one his own right?

Offline 197

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Re: Exhaust Upgrade
« Reply #5 on: September 10, 2007, 03:45:37 PM »
I think im going to get 3 inch out the side behind the rear wheels. Should I get it angled out or just straight out? I hate glasspacks with a passion so flomasters or something else im going to get.


Will I gain any mpg from this upgrade?
'73 C20 454

Offline 1973c20

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Re: Exhaust Upgrade
« Reply #6 on: September 10, 2007, 07:27:53 PM »
id suggest you go with the flowmasters, those sound the best IMO. im just getting the glasspacks cuz they're cheap. it seems like youd get maybe 1-2 mpg with the bigger exhaust due to better flow, but i could be wrong. anyone else know?

Offline 197

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Re: Exhaust Upgrade
« Reply #7 on: September 12, 2007, 07:22:08 AM »
I dropped it off last night. Went with duals out the side at a angel, with flowmasters. Cant wait to get it back!
'73 C20 454

Offline 197

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Re: Exhaust Upgrade
« Reply #8 on: September 12, 2007, 04:51:39 PM »
It looks great, but I got 2.5" insted of 3" the exhuast shop, said that the 3" Duals wont have enougf backpressure. Witch might cause valve damage. It sounds AWSOME and looks the same.

It costed $475 for true duals and the mufflers and tips. From the manifolds back.
'73 C20 454

Offline Rockin77

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Re: Exhaust Upgrade
« Reply #9 on: September 12, 2007, 10:53:08 PM »
197 what kind of mufflers did you get??
1977 GMC High Sierra 25

Offline 197

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Re: Exhaust Upgrade
« Reply #10 on: September 13, 2007, 04:35:40 PM »





It wont let me post images from my photobucket becasue of my last name peac*ock
« Last Edit: September 13, 2007, 04:38:14 PM by 197 »
'73 C20 454

Offline ccz145a

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Re: Exhaust Upgrade
« Reply #11 on: September 13, 2007, 04:58:30 PM »
my last name is "Pett*it". Wonder if I will ever run into this issue?  :)
1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
11MPG Downhill w/tailwind (but there ain't no hills here)

Offline 197

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Re: Exhaust Upgrade
« Reply #12 on: September 13, 2007, 05:32:15 PM »
LoL, it might,




'73 C20 454