Hi. My name is Tomas and I have a 1994 Phase 2 405 Mi16. It is completely standard and I want to put a 2-1/2 inch exhaust but I don know whic manifold would be better, the standard, a 4-2-1 or a 4-1 for this car. I also bought a chip and I want to put the 1.9 Mi16 inlet pullet that advance the inlet camshaft 6 degrees. Can you help me with this? You think I am doing the correct changes ?

Yes, you're on the right track but I thought they had a 2.5" exhaust as standard.

Standard collector is a big shit, put there collector from xsara vts 2.0. I've got 2.25 inch exhaust based on two borla muflers...it is tragically loud