I have a 78' GMC Sierra Classic..( I know, I know, It doesent meet the pre-73' category haha) but its been restored and I just finished pulling the engine and putting a new cam in, different intake, and headers. It has glasspacks that are whoknow's how old. I really want some super 40 flowmasters. How well do they hold up, are they worth the cash,..or would some magnaflow's be just as good...
I just know flowmasters are known for their deep throaty sound.
Thanks for any feedback,
-Dustin
