I know not much can be gained to hot rod the 5SFE motor but for the sake of ease of driving and some performance improvement I’m having mine rebuilt. Having the cams re-profiled, adding a header, with a current Weapon R intake replacing the stock air boxes.
My mechanic is suggesting a lower restriction muffler(s) but I’d like some input regarding the benefits/downside to doing so. Will I notice a difference in the performance by enlarging the flow, header back? The aftermarket mufflers I’ve seen are not an east-west design like the stock assembly. Short of a factory replacement are there performance mufflers available that are freer flowing with the east-west design, with a dual exhaust finish? Otherwise a “north-south” design hangs pretty low, visible from the rear. Don’t care for that. I don’t really need an appreciable increase in the noise generation, either. Magna-Flo appears to have mufflers that are not as loud as others on the market, which I’d prefer. Any thoughts on that?
I’m considering removing the stock cat as well. I know they’re heavy and at this age, it may not be working now anyway. Where I live cats are not mandated. If I do will that trigger the “check engine light?” Should I replace it with a “performance” cat instead?
I appreciate any insights you can give me. Love my “Deuce.” I’ve had it 17 years. I just
turned 70, but going on 35. Love how it’s flat in the corners and would love every possible bump in its quickness.