Hey everyone, im sorry for asking this question cuz im sure it has been asked a million times but iv not been able to be around my computer much to read everything so. I have a 1999 audi a4 1.8t and i was wondering what the best exhaust and cold air intake would be for me to get for my car and where i should look for them at. any thoughts will help thank you for your time.

 

evo motorsports for the CAI and remus for the exhaust.

 

CAI are really hot air intakes unless you mod it. I experienced power loss after installing mine

 

i just ran an hks intake and it not cold air but it made a differance i love it

 

well thats a lie. with the turbo your running the temperature of the air has nothing to do with power since you have a nice big front mount. if anything it would help because you got rid of some major restritions.

 

i think the perceived loss of power from CAIs is a combination of the warmer air, which will make at least a slight difference, plus the fact that the power increase would be at higher rpms...you sacrafice a little low end power for a little more high end...

 

Sorry David no lie, here's the math
Nope the intercooler has a certain efficency, and the efficiency doesn't change as temperature changes. Efficiency is calculated by (Temperature into ic -Temp out)/(Temp in-Temp ambiant) Therefore as ambiant air temps rise, so will the intake air temps (temp out)
If an 80% efficient intercooler had been used with an ambiant air temp of 70F and an comp outlet temp of 240F, then manifold air temperature would have dropped to about 104F = 240F – 0.8 x (240-70)F.

Also the stock airbox is one of the few things audi actually got right, its a very efficient design. I had the lltek and although I didn't log for proof, I experienced noticable losses once heatsoaked, so i relocated the air filter behind the foglight and that helped

 

david k... no response to his nifty math huh? cant argue with hard numbers....