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If possible go for a system designed for the car and avoid the likes of custom made systems like Powerflow unless you have a heavily modified car.
Stick with a Janspeed system or something if possible, they spent a good amount $$$ developing performance systems for your specific engine / vehicle with proved gains.
You really need to replace the entire system (including manifold) on a 4 pot K for good gains from a exhaust system. However not cheap! ?250 would probably only buy you the manifold new! Get checking ebay!
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