QG16DE

Hi, I am driving a Nissan Sentra N16 manual with a QG16DE engine. I have bought a used AEM CAI but the original AEM open pod filter is not in a good condition. Therefore I intend to purchase another open pod filter to use with this AEM CAI. Can someone please enlighten me which open pod filter is the best combination for AEM CAI?

I have another question about the exhaust piping diameter. I am using a 4-2-1 Hotbits header and I intend to do up my exhaust system by changing to a straight through muffler. What is the recommended exhaust piping diameter for a 1.6 manual? I am more to a "pick up" driver so I would prefer to have a better pick up rather than high end performance as my country do not have alot of long and straight road to hit the top speed of a vehicle.

Thanks for reading this thread and hope someone can give me some comments.

Thanks in advance.

Regards.