Wahh sume geng biru..takut dah gua mau post..hehe mmg mystique blue thread ni..looking good with the carbon fibre transformation..matches with your CSL n custom lips..good good..now time to upgrade performance wise to complement the weight loss..baru boleh kejar geng2 rempitss during official drive..hehe..
Some racun for you:
The first and foremost upgrade you should perform (which I believe u have) before anything else is the intake system. A highly restrictive dual-layer cotton box filtration setup is configured with an already moderately restrictive intake runner manifold. Replace the stock system with either a high-brand Dinan or similar make, or create your own. Because there isn't much room to get a pipe down under to the wheel-well area, creating a true cold air intake may prove challenging. Therefore, the easiest route would be to purchase or create a heatshield, as the stock system sucks air from a pocket near the front of the engine bay, which brings in cooler air from the front, especially when travelling at high speeds. What's important about the intake system is not so much how many horses you're going to gain, but rather the free-ability of air movement on the intake side. I've noticed on many 325's & 328's, that with the stock intake system, the car has terrible throttle response, and the car struggles to reach redline, even in first gear...
The second upgrade (and considered the most effective for e46 models) would be the upgrade of the exhaust system. Not sure how far have u done yours. The 325-type models & above all came with a dual pipe system that offered moderate exhaust flow, but left good room for improvement. The 323i models operated off the same 2.5L Flat6 engine, but utilized a single midpipe section, which created enormous restrictions in the exhaust. The muffler and cat converter were also compacted with more material to offer more sound-deadening, to those who liked extremely quiet driving experiences. Therefore, first, replace the midpipe with one off of an M3 of the same body-type, get a high performance aftermarket part, or create your own. Some people go as far as taking off the entire exhaust system after the headers, and they create their own true dual exhaust piping, and the whole works. The M52TUB28 is rated at somewhere around 190 bhp average, and is capable of producing much much more. The 323's, because of their extremely restrictive exhaust system, are rated at 168 bhp, and by upgrading at least the midpipe section, you're supposed to gain almost 20 hp to the wheels (ontop of the intake system).
By now, you're probably sitting right about 210 to 220 bhp, and you're car is getting to where it should've been out of the factory. But now, because these basic mods give you only small gains, its time to get into a bit more serious talk...
The third mod you should think about doing is replacing the intake runner manifold with a one from an M54B30. You can check all the parts on the manifold using realoem, and they are identical except the throttle body. Get the complete manifold and attached gubbins, plus throttle bodies from a 330 and a 328 (E46). The 330 one is a drive by wire type, with a slightly larger diameter. My thoughts were to do the same, to mock up an adaptor plate to fit the 328 throttle body to the 330 manifold. Not sure how restrictive the 328 throttle body were, but the equivalent mod on the E36 is supposed to get an extra 20bhp. The intake manifold runners are larger, and the entire matchup to the intake ports to the engine flow much better. This mod increases top end power dramatically. Power would probably kicks in right around 4000 RPM, and throws your car to redline extremely fast. Rumors have it that you lose a bit of low-end torque, but some who has done it didn't notice any loss.
Fourth, you should think about replacing those stock headers. Now this mod takes some extensive work. I'd recommend purchasing professionally-crafted true length headers, they add 15 to 25 horses after proper fitment and break-in. As with all major parts, make sure to attach new exhaust gaskets when you put on the new headers!
Now we're gonna get into the infamous underdrive pulley upgrade... tons and tons of off-brand and accessories companies claim to sell excellent underdrive pulley systems for the engine. I've seen some do decent, but some of them have caused disastrous problems. First and formost, some cranks made by these off-branders are lightweight, but cheap, aluminum grade material. They rust and crack EASILY. Once they crack, because these pulleys move at such high RPM, and lots of pressure is being put forth onto them, they will snap off, causing permanent engine damage if in use. Furthermore, the kit come with underdriving the actual crank, which is NOT recommended for this particular engine. It puts too much stress on the crank, and again, can cause permanent engine damage. Purchase these definitely from a reputable company like UUC etc.
ohh forgot one important thing..last but not least, do an ECU remap after all these mods have been carried out..surely gonna put a smile on your face :4: :4: :4: :4:
Good luck bro :4: