down pipe

I would search. Theres a lot of vendors who make nice ones. Buickgn.com, gbodyparts, rjc, to name a few
 
For the best fit & function...RJC 3" downpipe w/internal gate.

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Who makes the best affordable pipe? Would like one with dump option.

Dump / or test pipe with a cutout dump is usually a separate piece used in place of the catalytic converter - and not normally, that I have seen, a part of the downpipe.
You can buy those separately for not much money.

I think Gbodyparts.com's downpipe is quite good for the money.
 
I bought mine from Quad Air (Red Armstrong). perfect fit, with dump pipe (separate piece). very high quality.
 
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