ive used cold air intakes as a rule as the cooler the air the better for the engine. Hp increases depend on the brand but generally they say that you gain 3-8 BHP. CO2? do you mean Nitrous Oxide? thats pretty heavy gear. gotta make sure that the engine is bulletproof before upping the boost on that stuff. __________________ ![](image.php?s=fe4d16f8e42ba32de797f8e8af4a1947&u=2192&type=sigpic&dateline=1155146292) '96 318ti in Montreal Blue :m-tec sideskirts,m-bootspoiler,clear corners & repeaters .m-tech side mouldings, Magnex Exhaust System, leather armrest, F-15 gear Knob, 18" Evo 2's. Not Finished Yet...... http://www.myspace.com/davep_uk |