My stock intake and heads are getting ported and polished, im also getting a bigger cam and 1.6 rr

My question is with the mods in my sig. how much horsepower should i expect?

How much hp would i gain if i ditch the edelbrock shorties and flowmaster catback and put longtubes with an x pipe and true duals?

Thanks

 

Definitely ditch the edelbrock shorties (they blow ***) for some LTs. If you have the money go ahead and swap out the flowmaster for true duals also.