Quote:
Originally Posted by blykins
I don't think I agree with an undercar exhaust making less horsepower. It just depends on what size mufflers you go with.
However, most sidepipes are extremely restrictive and the collectors on sidepipe headers are sometimes at extreme 90° angles. There have been members here that dyno'd with and without sidepipes and there has been 100hp difference.
The horsepower difference is one of the reasons why I would go with undercar exhaust...
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Brent,
I agree ... it does come down to what muffler one uses. In the case of 289 ERA, as Wolf mentions there is not a lot of room to tuck a muffler up underneath the car, at least on the FIA, can't speak to the 427 ERA.
The dynomax #17762 that fits is not that large ... 2" diameter pipe IN and OUT, but it flows pretty well and sounds great. I would think the true FIA side pipes would flow better, but without a side by side comparison hard to say for sure.
The custom SpinTech mufflers that HealeyRick is running look like they would fit under just about any car.
I like the looks of the under car setup and makes getting in and out that much easier.
