Best X-pipe with cats?

68keyblr · Sep 3, 2007

I deleted the smog pump and so I need to replace the stock h-pipe and cats with a new x-pipe and cats that don't require the smog pump.

I have summit shorty headers, supposedly stock replacements but they are too wide for the stock h-pipe by about an inch or so.

Can anyone recommend a good x-pipe with cats?

Sicarius428 · Sep 4, 2007

If you deleted the smog pump you should get an off road x. If you get one with cats you will probably ruin the cat. Magnaflow run on the narrow side so I don't suggest those. Bassani makes a 3 piece one which will give you the most adjustability. Those are the two I have worked with but there are bound to be more out there.
Kevin

juiced_94gt · Sep 4, 2007

why would you ruin the cats if you remove the smog pump, i plugged the hole on the tube for the smog pump on my x-pipe with cats (BBK) mine are still ok and i drive my 331 stroker EVERYDAY about 60 miles with no smog pump OR EGR (deleted on the computer during the tune)

68keyblr · Sep 4, 2007

Still running cats because I still need to get through emissions test here in AZ...

I did some research on the cats, and the new cats do not need a smog pump at all, they are fine. Only the factory cats go bad sooner without the smog pump.

I went ahead and had a local shop here fab up an H-pipe with new cats. They don't do x pipes and I didn't want to wait so I just went ahead and did it.

I was able to get some break in miles on the 331 and she's pulling strong

Best X-pipe with cats?

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Best X-pipe with cats?

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