I have searched many posts and read manufacturer's website on the PLENUM SPACER. But have a few un-answer questions and/or want YOUR opinion:


"This stealth modification adds 11HP-13HP and is the simplest to install. The 5/16" plenum spacer is fully compatible with all stock and aftermarket strut bars. The engine cover easily fits and never needs to be cut. With the engine cover and strut bar in place the engine bay looks completely stock."
-http://www.motordyneengineering.com/g35.asp

1) I'm interested in the 5/16 due to still getting a significant HP increase AND still getting to use engine cover.
MY MAIN CONCERN IS WITH WARRANTY/DEALERSHIP. WITH THIS "STEALTH" UPGRADE CAN THE DEALER EASILY NOTICE IT? Has anyone had an issue with these and the dealer? For those who have it, is it REALLY stealth?

2) It seems that "11HP-13HP" is a realistic average based on other posts, those that have it would agree?

3) Is 11HP-13HP a notable difference when driving daily?

4) Is gas mileage directly affected by this upgrade? Good/Bad if any?

5) Easy to install w/ standards tools that I may have?


Thanks for your guys help.