Quote:
Originally Posted by 175K911
Perhaps I'm a sample of one, but I tried the single-in, twin-out Flowmaster 15 years ago with the stock heat exchangers on my previous '86 as my "winter" exhaust. It was the part number for a Buick Regal Grand National (there was one for a Camaro but the inlet was smaller). Had it fab'd by a great shop with the inlet at the top and both outlets at the bottom. Beautiful work. BUT, the car ran like crap! Had a resonance and giant flat spot at 2800-3500 rpm that made it miserable to drive.
The shop (TPC, known then for their supercharger kits for Porsches, and today racing Porsches) figured that the turbulence in the center of the muffler where the exhaust had to split into two for the exits was the cause. So we cut off the right side exhaust, welded a large washer into the right side muffler outlet to reduce the size from 2.5" to about 1.5" and it was a lot better but then sounded funny. I eventually just cut off the right side tip and welded the outlet shut, and voila the car ran fantastic and sounded great too.
I know that lots of folks here have used the 2-in, 2-out Flowmaster (and Magnaflow) with great success, but this is the first time I've seen someone try the same 1-in version that I tried back in the mid 90's so unsuccessfully. Capt. seems to have done it so perhaps in the past 15 years Flowmaster has changed the construction of the muffler?
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Just a side note to this.. I recently went from thermal destroyers to early HE's.. the car ran "OK" after I did this.. but then I got to thinking that my mixture might be off.. so I went ahead and did my usual richen it up until it wont idle right and then backed it off a little.. totally woke up the car and the sound was richer, fatter...