ii catalyst and pulley kit
Could someone please give me a quick lesson about the secondary catalyst cut and pulley kit?

Would secondary catalyst cut actually give me more power or does it just change the sound? Or what else does it affect? Fuel consumption etc?
Oh, and would straight pipes be better? Or X crossing?
And what exactly does installing the pulley kit give me?
I am planning to do the catalyst cut for sure, but if someone could tell me what good does the pulley kit do, id most likely do that as well

BIG BIG thaks for any help here
ps. i have a 2003 SL500
I would be very thankful if you could give me some advice where to get the parts. Any store in US that could ship them to me..
I am really thinking to order it from states because I have my car in switzerland and they dont know s**t here.. (i guess i could get eisenmann but its a bit pricy?)
I would order the parts from states right now (and hopefully they are at least smart enough here to put them on here).
At least necessary parts to change the reso..
Thanks a lot for advice and help!
I would want to get a decent ready-to-install x-pipe from states because I know I would do better this way..
+ I must admit that I love the low dollar (since everything is so damn expensive in europe and people want to rip you off in every corner :p )
Thanks for help though
T


