DrUnKeN PaNdA said:I agree with JDM sam. Here is a quick test, drive your car for a hour. Pop you hood and put your hand on those stock "plactic" pipes. WOW kinda hot. Now find a car with aluminum tubing...have fun scolding your Fu*king hand ...lol. Anyways I believe the companies do this to save money and also keep IAT "intake air temps" down. If you know your HP theory. The colder denser charge of air the more bang.
Now I am not sure about that whole steel tubing idea. Steel may be alittle stronger but alot heavier, have fun bending those pipes, and I can't say I've seen a steel intercooler kit.
I'd go with aluminum and of course powder coated to resist some heat. Then pay a vist to www.designengineering.com . They seem to have their s*** straight. Plus they sell the bad ass CRYOGENTIC freeze kit for your intercooler.
The problem with the piping is not really the material as it is the various diameters and useless bends. The steel tubing can be made lighter with the proper gauge aluminized steel. Stainless is alot heavier but looks better. Aluminum is great but a little more expensive for the proper bends. We use aluminized steel mandrel bent tubing for our kits and custom installs. They work really well. Bottom line the underhood temps will be what they may. Changing the tubing will not decrease that. With the properly designed intercooler system and water injection you'll get really close to ambient temps. If your clever there are many other ways to bring down charge temps from the intercooler which DOES NOT include NOS sprayed upfront.
But to answer someone elses question from the front page. Yes upgrading your pipies will improve the efficiency of the system. It will help keep pressure drop to a minimum if your still using the stock cooler. As far as HP is concerned, IMO with the stock protege i would think you could see earlier spool up and an increase in low end torque. Higher end levels of HP would also increase.