New here, but old gear head.

[mrpug]

Hello guys.,
I'm working to do mild upgrades to a 2006 Ford focus w/2.0 Duratec( I know a focus ... really.. lol ) since ive done a couple of them air intake where the filter box was away from the engine behind the driving light area. and did the ignition spark advance ( like on the Mazda engines )
been thinking of going to a slightly larger exauhst say to a 2 1/8 simular to the old VW 1.8 16v. GTI to still maintain some lower end torque but help with flow. instead of doing the 2.25 , since its a daily driver and not a performance oriented spectrum maximum gains.
end goal of getting close to 160 hp. suggestion are welcome and thoughts on exauhst pipe size from what I've mentioned..

 

[obi_waynne]

Personally I'd drop in a high flow catalyst that's where the restriction will be, the standard exhaust size flows really well upto around 180hp.

 

[obi_waynne]

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