I‘m at altitude (over 4000 feet). Before I lower backpressure, I figure I ought to increase, if possible, the air my engine is getting.
There are various options for increasing air intake, and also, other measures, checks and adjustments to make in conjunction. I'm not sure what your setup is currently but I'll assume it's stock. It's clear that you are looking to modify your mixture air as opposed to airflow into the bay for cooling purposes. Yes, a good quality air filter will help, but beyond that, you can make adjustments to your mixture to compensate for altitude and the addition of a hi performance cold air intake would most likely prove beneficial. There are hi performance kits available for your 993 which come complete with exhaust, headers, cold air intake box and assembly and proper filter. Although a full high quality kit like this would run you about $2700, I think you would see the benefits you are after. You can add the airbox without modifying the exhaust system, but remeber, what comes in has to go out, and you need to balance out both the intake and output accordingly. The 993, last of the air cooled classics. Nice choice. But I still love taking my 69 out on the twisties and hearing those Webers roar.
No, for god's sake don't put a KN filter in that car!!! Porsche did not leave a lot of HP on the table, and a simple drop in filter is just a waste of money and may screw up the car. There is a good aftermarket support system for your 993. If you want more power, think of your intake/engine/exhaust as ONE LONG TUBE. If you increase the size at one end, you'd better be doing something either inside the engine or at least on the other end. I'd say that perhaps a really well-designed aftermarket air box or ram-air, coupled with some good exhaust headers and mufflers is one way to gobut it won't be cheap. Please don't put a KN in there, it's worthless and dyno tests have proven this time and again.
Porsche are Holy car really, but with that Godly side a devil comes with it which is mods, and repair. If you work with a porsche then you will ruin it. Its just the nature of a Porsche. When the Porsche comes home its a work of art but if you add or play around with it you ruin it, but if you get another master artist to put details then it become greater, this means you must only and only send the Porsche to a CERTIFIED Porsche dealership(repair shop) and get them to do the job for you and then nothing will go wrong wiht it after. You just need to deal with it its a Porsche's nature to be like the beautiful snorting stallion its was built like from the factoies in GERMANY. If you change some thing then in one day you will need to repair it and it will cost lots of $$$$$$$$$$$$$$$$$$$$$$$$$$$ and will do that over and over again beause it has this stray part thats not PORSCHE in it. Thats why the intake must and only be Porsche certified from the dealer only!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.
