Exhaust size?

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May 27, 2002 | 03:11 AM

Tim06

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Racer

Joined: Aug 2001

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From: Astoria OR

Exhaust size?

On a stock 89 what is the diameter of the rear Y pipe?

May 27, 2002 | 03:19 AM

Tim06

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Racer

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From: Astoria OR

Re: Exhaust size? (Tim89)

Also when I replace it, is a crossover better as far as performance is concerned?

May 27, 2002 | 12:28 PM

Team Owner

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From: Phila., PA burbs

Re: Exhaust size? (Tim89)

I'm pretty sure the stock size is 2 1/4" diameter. I've heard the rear y-pipe with the crossover built in cuts down on interior resonance, but I doubt it does much for performance. I think going to 2 1/2" front and rear y-pipes would give you a better performance gain. I'll let you know next week when I have mine installed.

May 27, 2002 | 12:36 PM

scorp508

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From: Boston, MA

It goes from 3" at the rear of the convertor to 2.25" into each muffler.

May 27, 2002 | 05:22 PM

Tim06

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From: Astoria OR

Re: (scorp508)

Where can I find a 2.5in rear Y? The ones I have seen are 2.25in. Do I have to have one made? The ones I saw in the forum mall are "86-90 Factory-style Y-pipe, rear, w/factory heat shields" ZIP-EX-432-SC" and "86-91 Crossover tube Y-pipe, O/S" ZIP-EX-479-SC" but I don't know the diameter of these.

[Modified by Tim89, 4:46 PM 5/27/2002]