thank you for your answerI have the GuppeM and you will have gain's but not enough to feel them. To really see gain's you have to combine it with exhuast and software!
I think this is a much better option if alot more $$$. You get a similar sound to the CSL with it and doesnt need Alpha N software to run it.Gruppe M is the best aftermarket filter for the M3. Just be aware that the M3's stock airbox is great as is. If you're looking for a good aftermarket part, however, the gruppe M is it.
Just contact Roy.anyword on that CA csl intake? thats what i want but i cant find it anywere!?!? any leads would be nice. thanks in advanced.