I installed a Flowmaster on my car about 2 years ago, I don't remember the series of the muffler. Is there a way to tell? It's 2.5 IN with dual 2.5 out. I need to get rid of it, it sounded great this stock manifolds. Now with the headers and highflow cat it is just annoying. It's got this high RPM buzzing noise, I think something came loose in the muffler. I want to replace it with a cheap dynomax but don't want to gain a lot of back pressure. I want to compare the flowmaster to the dynomax but I don't know the series.

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1988 L98
Vette Heads/no EGR
SLP Headers/Y-Pipe
ARAP bin

 

Its the 80 series, all crossflows are. I had one many moons ago, I liked it

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Black 89 IROC...355, Solid Crower Cam, TFS heads.
12.0 @ 120.3mph with a 1.9 60ft...all motor