AMC 258 Exhaust upgrade questions -
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post #1 of 3 Old 08-24-2013, 04:30 PM Thread Starter
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1989 YJ Wrangler 
Join Date: Aug 2013
Location: Bozeman
Posts: 4
AMC 258 Exhaust upgrade questions

Hello all! New guy to the forum. I have a 89 YJ with the AMC 258 and TF 999 Tranny, and am looking into upgrading my rusted over exhaust system. I'm kind of torn between putting together a Borla system (pricy and takes away money from other things I could be doing to it) or simply going with an OEM kit and calling it a day. I'd like to get some more power out of it, but the cost disparity is pretty significant. I saw on Quadratec that the Borla headers might require some modification due to the automatic transmission, but what that might entail is beyond me. Does anyone have experience with a Borla setup like I'm talking about? If so, what are your thoughts on it? Any questions and/or input are always appreciated.

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post #2 of 3 Old 08-24-2013, 05:07 PM
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1990 YJ Wrangler 
Join Date: Apr 2011
Location: Jacksonville
Posts: 3,913
I have pacesetter header and a flowmaster. It sounds great and it helps get things flowing better

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post #3 of 3 Old 08-24-2013, 06:33 PM
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1990 YJ Wrangler 
Join Date: Jun 2007
Location: San Diego
Posts: 18,609
I have a borla header on a 258 AND an auto trans. The problem is the shift linkage bracket that bolts to the engine and crosses over to the tub. Was not had to fabricate a new bracket. I also had trouble with the front drive shaft hitting the collector but that may have been unique to my set up. For that, I had a local shop cut off the collector weld it on facing front. Then they bent and built a new pipe that wrapped around the front of the oil pan, TJ style. I had some other work done at the same time and the entire bill was about $300, not including the header (got that from a JF member for pretty cheap.)

As for performance, I don't know that I noticed any difference. It sounds good though.

shift bracket

new collector

wrap around

it's not nearly as close to the starter as it looks

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