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YOUR RESEARCHAnother surprise from my '99 C4...
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Check intake plenum
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Suggestion
You should check your intake plenum to make sure PO didn't swap in a X51 package for you too.
Leading evidence: 'Check intake plenum' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check intake plenum' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Working to replace the starter this afternoon and I didn't pay too much attention to the parts coming off to provide "access" to the starter bolts (that bottom bolt is just SLIGHTLY harder to access than that one water pump bolt)...but tonight while I was cleaning up the throttle body and the plenum, I noticed this.
Nice surprise...thanks, previous owner!
According to their website, your car should now be able to do this:
GT PRO Performance Tuning WWW.GTPRO.COM fire breathing 850rwhp dyno - YouTube
So, I'd keep it.
If that's the only aftermarket performance part you have left on your car, I'd probably sell it. If you have other performance parts on your car or are planning to get some, I'd keep it.
You should check your intake plenum to make sure PO didn't swap in a X51 package for you too. LOL
I'll be checking part numbers when I put the new starter in tonight. I do not see any of the parts in aluminum rather than plastic, which I thought was one of the obvious indications that the X51 upgrade is in place...
The plenum is easy enough to swap out. If the throttle body turns out to be larger, I'll probably keep both.
PO spent a lot of money on this car. It's crazy to still be finding upgrades 4 years later.
Also, I'll need to find a Turbo badge, since I clearly now have turbo parts. It says so right there on the plenum.
I wonder if I can just cut some gills out of electrical tape for the rear bumper cover to give it that narrow-body-turbo-996 look.
Does anyone have an extra GReddy sticker? I definitely need one of those now as well.
Welp, off to Ebay up a fake blow-off valve.
Don't forget to carry around a print-out of the IPD plenum dyno of 25+ whp in case you have to flash it out the window to the teen that doesn't believe those badges/stickers/sounds.
If you get the electronic bov, you'll definitely have to get the interfooler to back it up.
If you have the 3rd radiator cutout, even easier to install. You will have to buy the extra piping though to run it all the way back to your tb though.
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