2.5" and ext wg vs. 3-3.5" and int wg.... - Saab Performance Bulletin Board - Saabnet.com
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2.5" and ext wg vs. 3-3.5" and int wg....
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Posted by kooch (more from kooch) on Sat, 18 Jun 2005 11:45:42 Share Post by Email
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i have a custom 3-3.5 downpipe from the turbo to the cat, then 3" cat back.

i picked up a downpipe with an external wastegate, but the flange on the bottom end bolts to the stock 2.5" intermediate pipe to the cat.

i have two options as i see it:
1. leave it as is and wait until i can get someone to weld up the 3" to the ext wg downpipe.
2. swap out the 3-3.5" turbo to cat pipe and install the external wastegate and stock intermediate pipe to the cat.

i know i will lose some by dropping to the stock size pipe, but will the external wastegate offset and even over compensate for the difference?

i will eventually go to the 3" with the ext wastegate, but not sure which is best for the time being.

any thoughts?

btw, 90 900turbo, programmable ecu.

thanks.

posted by 24.60.15...

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