Mike, I agree with you on this. The only real way to verify claims of power increases is thru actual testing. Like David T was saying, these engines were developed with all the parts working as a "package" and just changeing/modifing one part of this package does not necessarily equal performance gains. When Casey first came out with his new air filter housing I liked the design, but questioned the actual gains that were claimed. We've done actual dyno testing (Bob Brandies has the charts) of the stock Delorean air filter housing and different filter combinations available for the car and, believe it or not, the stock Delorean air filter housing is designed and works very well with this engine. With air flow in to and out of an engine, as long as you are not restricting the required amount of air an engine needs, larger is not always better. Maintaining or increasing air velocity is a major factor in performance. That's why intakes use long runners and headers are made out of specific smaller diameters and lengths of tubing, so they can maintain the velocity of the air moving thru them. If you make things to big, you kill all the air flow thru it. Thru dyno and flow bench testing it was found the stock D air filter housing flows air very well, and the design, by becoming smaller at the intake connection, actually directs and increases the velocity of the air flowing into the engine and the intake system. Matter of fact the engines performance actually drops off when the air filter housing was removed completely, which also shows the stock filter housing is not restricting the amount of air the engine requires or can use. The design of Casey's air housing actually gets bigger at the connection point to the intake system, which actually slows the air velocity into the engine. I did some flow bench testing of one of these housings and unfortunately found no performance gains to be had. I do think it's a very good looking air filter housing, but like others were saying, if you're going to get it, get it for its style. Marty From: mike.griese@xxxxxxxxxxxxxxxx Subject: RE: Upgrading the Air Filter? I am always skeptical of these claims because they are never done with any kind of rigor. I'm willing to bet that most every DeLorean can benefit from a tuneup - with OEM parts or aftermarket. Seat of the pants evaluations are useless. I would be willing to believe claims if there are documented dyno runs before and after every change, measured against new parts to the original design spec as a baseline. Anything else is marketing. Ever notice how those stupid tornado intake infomercials ALWAYS do a tuneup and filter change on the car with the installation of the part? -- Mike [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/