I totally admire your dedication to going "all out" on the 4.6 with parts as nice as this. My sensibility bone would just keep getting in the way from even considering a $5500 set of long tubes. I'd be surprised at 40hp at the crank. My 4.6L Mustang didn't make that many after BBK long tubes and a tune. Came close, but those long tubes cost $500.

True, LS is the "cheapest" way to big HP. I, like you, prefer a BMW engine in a BMW... but the LS would be cool too. I'm definitely hooked on your project and if you've got the scratch to go with these, AWESOME! Looking forward to seeing what the results are for sure.

__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)