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I am going to mod the CAI and ECU mapping for this car and also looking at exhaust manifold mod from 4- 1 to 4-2-1 with performance cat. The exhaust manifold with performance cat is pretty much know how to do it just the catback might need to test with different sizes. Unfortunately the...

Hi guys , I need some advice on the exhaust mod. I own a polo vento 1.6 MPI NA engine . Engine code CLSA is a EA111 engine. I check all over the internet, looks like no one modify the exhaust before. I want to mod the cat back but i have no idea how many inches of diameter i can increase...