I have an in tank filter on my R40. I have not used a filter at all with this car. Some use it for the exhaust side too....to block any crap from going into the fuel tank.
I used to run filters religously but always felt they could be causing more trouble than they are helping.
If you have an intank fitler. Theres really no reason to run it , but in theory it wont hurt. But I always feared clogged filters or leaky fuel lines letting in air. I think its just one more thing to worry about , no reason to make it more complicated.
As for the exhaust side , cant hurt and if it leaks who really cares , its blowing air in anyways. Also helps calm the pressure of air entering the tank. Which will help keep your fuel from bubbling, which in turn will shoot a bunch of bubbles at the carb at fuel throttle and can cause some leaning and tuning issues thats sometimes hard to pinpoint , especially when it happens when your car is whizzing around a track.
Last edited by Artificial-I; 01-16-2006 at 07:54 PM.