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Old 01-02-2018, 04:45 PM   #4
Tom
driving is in my blood
 
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Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,690
Re: Exhaust help! 5.7 vortec plugged cats..worth paying for larger diameter replaceme

Bigger setup works fine your shop is dumb. On a totally stock 350 I doubt you'd see much from larger pipes, but long tube headers do help. Again, not really worth it for a stock winter beater in my opinion, ice and snow kinda slow things down regardless of engine output.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle.
-98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes.
-02 Suburban 4x4: leveled front
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