ILBCNU6,
I have to disagree with you about whether you can have flow and sound reduction. When my car ran 11.7's with a te44 years ago I ran three runs uncapped and four runs capped within 3 hours at night with no change in weather conditions during that time. If I still had the time slips I would defy you to tell me which ones were capped or uncapped runs. I ran through the same three mufflers I do today. I took the dump out after those runs. There was no point in having it.
My car is so quiet that on the freeway the normal road noise and wind noise drown out the exhaust noise. There is no drone at any speed.
Today the car will run mid 10's at 128mph. I could explain all the mods but with a PT54 and 3500 lb car with driver, I don't think I would gain much with a dump. I ran a LT1 3" maf and just put the LS6 3 1/2" maf on and hope to crack 130mph on pump gas and methanol this year through three mufflers.
The only downside is it wasn't cheap, and of course, it adds weight to have three mufflers. It flows good enough and I like quiet. I would say my system costs about three times what the hooker system costs. Is it worth it? I don't know, but mine is all stainless and will last forever.
My stage 2 car has the same type three muffler system on it and with a PT74 it has gone 9.45 at 143.8 and it's quiet too. You can't hear either of these cars go down the track.
