I have to agree with Yellow Horse on the gears and CAI. 4.10's are too low for this car. The 3.90 seems to be the perfect ratio for 1/4 mile. What are your RPM's in 4th through the traps with those 3.90's?
As for the CAI keep it simple and stick with a straight through design. Easy to install, inspect, and maintain.
After taking back the BBK CAI, I purchased and installed the K&N FIPK. I did ask K&N about it and they had not yet tested it on the '04. It did work without any problems and no check engine line . No Screen on the FIPK either, so the dealer was wrong about that being the problem. I did notice that the BBK CAI had smaller tubes going to the filter than stock and that 90 degree turn into the fender well can't be that great for airflow either. I really liked the BBK looks for the CAI, but it proved to be useless on my '04.
Next, I have to install some chassis stiffening and a shifter. The wheel hop is killing me and I really hate the stock shifter. If I were to do a smaller pulley, I would have to get 315 tires to get it to hook. On stock tires it breaks pretty easy (but it was worse with the stock gear).
Car looks and sounds great! Being a convertible, it is a bit of a sleeper.
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'04 Mystichrome Convertible
BBK Long Tube Headers, X-Pipe and high flow cats
Magnaflow Catbacks
SCT Base Tune
4.10 gear
K&N FIPK
I installed the JLT CAI, mated to the K&N FIPK. A little bit of a PITA to put on, but it works and looks great IMO. The only problem I had was not being able to get the heat shield in, it will have to be cut to fit.
Are both of these out for the '04 Cobra? I couldn't find the K&N FIPK for the '04 Cobra on their website and where can I find info on the JLT? I was hoping someone who had one installed on te '04 could tell me if they have one that works
I have to agree with Yellow Horse on the gears and CAI. 4.10's are too low for this car. The 3.90 seems to be the perfect ratio for 1/4 mile. What are your RPM's in 4th through the traps with those 3.90's?
As for the CAI keep it simple and stick with a straight through design. Easy to install, inspect, and maintain.