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Search: Posts Made By: coultond
Forum: Grand Cherokee - WK 12-05-2009, 11:54 AM
Replies: 25
Views: 2,785
Posted By coultond
Re: hemi exhaust

The type of steel used is the difference.

"Installer series" = aluminized steel
"XP series" = T409 steel (most exhaust systems use this 'cheaper' grade)
"Pro series" = T304 steel (better steel...
Forum: Grand Cherokee - WK 09-02-2009, 10:13 AM
Replies: 18
Views: 1,063
Posted By coultond
Re: Couple of questions

Just to clarify a few of the above octane contradictions. The following is copied from page 306 of the 2007 Owner's Manual which is available here:
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