I have an 04 996 40th Anniversary with the X-51 (26,700 miles) and just bolted on an IPD intake plenum this weekend. The dyno results are in my profile photo album, but the long and short is that we did 3 baseline pulls (all very consistent output) with the best at 299 HP and 236 ft/lbs. Installed the plenum and pulled 314 HP and 250 ft lbs on the 3rd pull. The computer was adjusting on every pull (we didn't reset it) so it is possible it may be putting out slightly more at this point. The biggest gain was 25.6 HP at 6628 RPM.

Dyno was a Dyno Dynamics, all numbers uncorrected at the wheels in 3rd gear.

I've put about 150 miles on it since install and no driveability issues or check engine lights. Definitely feel a difference. Well worth a look if any of you were wondering. Not much info on tuning parts for X-51, so I hope this helps. More to come...

 

nice, i have been thinking of getting one myself

 

There hasn't been a plenum thread in while. This always sparks a lively debate. I'm glad you are happy with your mod!

Now posts some pics.

 

Wow! 299 to the wheels from the stock X51 is great. Very nice.

 

Those are the numbers we all like to see... $$ for HP. What's the difference between the IPD and RSS plenum?

 

Doug,

The IPD Plenum (Innovative Pro Design) is the products proper brand name but many folks call it the RSS Plenum since we are the exclusive distributor. It's the same product. Thanks... B

 

This mod has fierce champions pro and con. The search function is your friend.

 

You can buy the IPD plenum from RSS...so it's the same thing!

 

Agreed, especially on a Dyno Dynamics. Very impressive.

 

Alex, thanks for taking the time to share the results. Very impressive gains.

 

Their uncorrected numbers...SAE corrected will mean lower numbers. The fact is it looks like he gained 14rwhp at the peak, more at other rpm.

 

if anyone is interested i have a IPD plenum new and never used for an e-gas car... i bought it from a previous group buy, but never had a chance to install it... i would be willling to let it go for a fraction of what i payed for it to a fellow 6speeder...Scott 9543980111

 

PhantomMoneyPit, I sent you a PM.

 

e mail me i am intrested john@a!expert.com

 

I posted some more pics from the dyno day in my albums including pics of the stock/IPD pieces. Hope it is helpful.