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Maple I saw your thread earlier, it's terrible that you lost so much power. On our 2.5L cars you have to be careful with doing the custom piping, cause once you do you will be travelling much slower than you use to be stock...
Bigger piping only works with cars that are turbo charged, with our oem system I would recommend deleting the secondary cats only and using an x-pipe if you are still keeping your factory cats.
If you ever wondered, I have my factory cats on still.
But with the cat's removed... we were looking at a 10-15whp gain with the OEM muffler, resonator and secondary cats in place.
But most importantly is truly finding a real tune for these cars... Most tune makers are not even properly optimizing the potential of our N52 engines.
What you can do is basically flash your car with the european 323/2.5L N52 tune and get around 215HP stock, but beware your car will throw engine lights cause we have more restrictive cats here in NA.
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