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If I were to critique the exhaust, running 2 1/2 back from the engine to a Magnaflow 12288 or similar that would give a 3" outlet would give you a more balanced flow with no loss of power. If the engine was another 20hp more then 2 3/4 front pipes would be in order. Magnaflow does make plenty of dual in dual out mufflers that would have lowered your workload a bit. But I do again have to say, nice job here.

Thanks a lot for the comments. I understand what you are saying. Building the exhaust I also kept in mind that maybe one day I want to go for headers or/and different cam or/and blower, so I went bigger hoping that it could save me some time in the future, if I'd like to go for more power (there is never enogh power, you know).

Raider 6.0 V8 386hp, 397ft lb, 3?exhaust, Megasquirt ECU, EDIS ignition, Innovate LC-1 WB Lambda, NV4500, NP241 with JB conversions ?super short? SYE kit