Re: 427 FE engine, under car 'street' exhaust system?

[DanEC]

ERA undercar headers are a little unconventional but basically the collectors are 2-1/2 inch and I ran 2-1/2 inch all the way to the rear bumpers with non-crush bends. A 2-1/2 inch exhaust system with low restriction mufflers will flow a lot of exhaust and support a lot of HP.

I would be leery of trying to run anything bigger than 2-1/2 inch as you are also compromising ground clearance. I used 2-1/2 inch deep mufflers by Spintech to maintain as much clearance as possible. If I were re-doing it I would have gone to 2-1/4 inch tail pipes from the mufflers back. By that point the exhaust temps have come down enough that a little smaller pipe won't compromise overall flow. It wouldn't have been so tight in the rear wheel wells either.

[AC Ventura]

Originally Posted by DanEC

ERA undercar headers are a little unconventional but basically the collectors are 2-1/2 inch and I ran 2-1/2 inch all the way to the rear bumpers with non-crush bends. A 2-1/2 inch exhaust system with low restriction mufflers will flow a lot of exhaust and support a lot of HP.

I would be leery of trying to run anything bigger than 2-1/2 inch as you are also compromising ground clearance. I used 2-1/2 inch deep mufflers by Spintech to maintain as much clearance as possible. If I were re-doing it I would have gone to 2-1/4 inch tail pipes from the mufflers back. By that point the exhaust temps have come down enough that a little smaller pipe won't compromise overall flow. It wouldn't have been so tight in the rear wheel wells either.

Great installation. Sure looks cosy up by the rear tyre....but looked at you links and car looks and sounds fab. Can I ask how long it will tick over stationary in traffic for example on a warm day before boiling over? That and cockpit heat my only concerns.