Would a hedman y pipe with 3 inch collectors bolt to my stock manifolds and would it be much of an improvement over my stock y pipe.

 

nope the hedman y pipe wont bolt to your manifolds . when you buy the headers you have to buy the y pipe also .

 

SLP has Y pipes for stock manifolds for $165

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-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options