Proficiscor

As the title says I'm wondering about that because I'm about to have some exhaust fabrication done. It's a minor consideration for me but I am curious anyways.

Just to share; My goal is to create a budget yet effective free flowing exhaust for my 87 NA. After doing a bit of reading here and elsewhere I decided to buy a mandrel bend for the downpipe from exhaust manifold 2.5 in heading into a long dynomax racing bullet (cats are being deleted), then into the Y-pipe and out into a pair of Walker Ultra Flo SS's 2in mufflers. 2 in mandrel bends also purchased for this section.

I plan to use an airpump mod for 6PI.

I was planning to replace the Y-pipe with 2.5in into two 2in pipes but now I'm wondering if that would make any performance difference. I've been assuming that the Y-pipe intersection doesn't involve crush bending so if it does then I should go with new pipe but if the stock exhaust is mandrel bent then I might leave that section alone.

SpeedOfLife

iTrader: (16)

If you don't have cats and have at least the same diameter pipe as the stock exhaust, I don't see you NOT getting some added performance.

Proficiscor

Since there seemed to be some confusion just disregard everything in my opening post.

My only question is: Did the original OEM 87 NA exhaust piping from the factory use mandrel bends or are they crush bends.

Makenzie71

Considering the stock exhaust is comprised entirely of flanges, catalytic converters, a crazy transition through the split, and mufflers...I would say the exhaust doesn't have any bent tubing at all.