Author Topic: 1989 454 TBI Exhaust  (Read 2925 times)

Offline Mild Thunder

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1989 454 TBI Exhaust
« on: May 22, 2010, 08:23:00 PM »
Just bout a crew cab dually. 454 TBI, TH400, bone stock. Exhaust is original and still has the factory muffler and resonator behind it.

Wondering if its worth it to go to headers, and 2.5" true duals. Or just leave manifolds on and do the exhaust from them back.

Truck will be used to tow my 10k lb boat, so would like to free up some HP without getting into the engine at this point. Any other tips for upgrading power? More into the towing/torque than anything.

Offline Mild Thunder

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Re: 1989 454 TBI Exhaust
« Reply #1 on: May 22, 2010, 08:24:35 PM »
Pic

Offline beastie_3

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Re: 1989 454 TBI Exhaust
« Reply #2 on: May 22, 2010, 09:41:04 PM »
Go for it.

Offline malibu795

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Re: 1989 454 TBI Exhaust
« Reply #3 on: May 23, 2010, 08:18:21 AM »
def worth it!!!!!!
adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline three8six

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Re: 1989 454 TBI Exhaust
« Reply #4 on: May 23, 2010, 10:27:32 AM »
Def worth it

Offline mountaindrew

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Re: 1989 454 TBI Exhaust
« Reply #5 on: May 23, 2010, 09:25:20 PM »
I tow 12k with my 86 qjet 454.  I have manifolds and duals and I think that 454 would pull Oklahoma if you could wrap a chain around it.  Headers aren't going to change that.  Headers look cleaner if you have the AIR lines in your manifolds, but they don't bother me too much. 
1986 Chevrolet C20 Silverado, C6P, 454, TH400, 3.73, FF
oil and trans cooler, 6 qt oil pan, p/w, p/l, air, cruise
17" Dodge wheels & E rated Michelins, Curtis hitch, Prodigy, Equal-i-zer