they used 6 an 7 inch exhaust systems on old fishing boats and trawlers with the 5.9 cummins in it, they droned so bad you almost wanted to jump over the side. i cant imagine how you could stand 5 inch let alone 7 inch.
hey just curious, you wouldnt happen to have a dp for a 99 24 valve bigger then a 3 1/2 inch would ya? because right now my egt's without the box being on are running about 1500 degrees which isnt good, so im needing a bigger down pipe hoping to cool it down... when i turn my box on i can peg the 1600 degree gauge with now problem. thanks
:whs on the turbo. Other thing you could do is a 5" system, then take your stack and adapto it to a really long 7" tip (to the axle or thereabouts) so people behind you or someone just taking a casual glance would think it's a 7" exhaust. But once again on the drone/echo issue...........
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