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You will NEVER see more than 10hp from exhaust/intake and tune put together. Mods are not additive for one and neither of those adds more than a horsepower or two. A true tune possible to gain 10 hp so you can pick that up.
To be honest the best by far upgrade for handling and performance and speeds is lightweight wheels and tires. Saving on rotating weight is by far the biggest benefit to a car's acceleration. Stock wheels and tires are HEAVY. You can get many 18 or 19 inch wheels that weight in at 25 pounds which is 7 pounds lighter than the stock 330 sport wheels 18 inch.
Then you get a light weight tire-cheap general exclaim weight 5 pounds less than the stock tires. PS2, conti DWS also weight 4-5 pounds less per tire and are better quality.
So you can save 40 pounds (10 on each corner) of rotating weight that will noticably improve acceleration. Also since its unsprung weight it will make a ton of difference in ride comfort and ride handling more than suspension would. Last it is 40 less total pounds which is a benefit itself.
You can remove the spare for another 50 and that is about the best you will do.
It is a misconception that adding smaller wheels is better because although they potentially can be lighter (17 inches) the tire used has WAY bigger sidewalls and is WAY heavier-and for rotating weight it is the most outside weight of the rotating circle (end of the fulcrum in torque) that is important. Weight at the center of the rotation-ie the wheel is much less important. So light weight tires are the single best mod you can do for performance.
If you drive the crap out of the n52 and redline it all the time youll have fun. I have driven all 255 hp almost every day for 60k miles and 4 years and engine is as smooth as day 1 and car feels as good. You need to be above 6500 RPM's to see the last 30 hp of the car. Under 6500 it is not a lot different than the older m54 in the e46. Plus the 330 has the benefit of revving to 7k and making peak power at 6800 v. the 328 makes it at 6600 and makes less power. So you really benefit revving it to 7 k to get anything out of the car.
Sound is another thing that I consider "fun" about a car. A nice exhaust sounds good with this engine and makes driving more enjoyable. You can enjoy a car using different "senses" not usually all at once. So if you occupy your enjoyment from a nice sound and good handling, youll less notice the lack of torque and acceleration you would if simply drag racing all day.
good luck and enjoy
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