The best way to learn about those 2 things is to do a search and start reading all the posts on the subjects. Just a short take, a CAI "cold air intake" gets air from outside of the engine compartment most likely behind the front bumper, from here it is "cold" air and improves the breathability of the engine increasing HP by about 10 ponies on average. The Hyper grounding kit grounds out certain points of the engine via the negative battery terminal. This smooths out the engine and helps it idle better as well. Plus it looks cool

2004 Coupe, 5AT, Twilight blue / Willow int, K&N Typhoon CAI, Hyper Grounding Kit, Mtek Xenon Fog/High, Clear corners, Hypers, 18's, Aero, tint, Premium.

 

the g35 has a tremendous "look back" effect.

as you walk away, you just keep looking back

04 6mtC, DG - possibly most babied G on the board.

 

This car simply put, is just absolutely amazing. From its sporty good looks to its handling and power delivery, also not to leave out its amazing "Farrari like exhaust sounds". This is my dream car at 1/3 its price.

This car puts a smile on my face every time I drive it and stare at it.

Peace and happy motoring.

 

I agree 100% studly and Logical... This by far is the best bang for the buck out there by far...

2004 Coupe, 5AT, Twilight blue / Willow int, K&N Typhoon CAI, Hyper Grounding Kit, Mtek Xenon Fog/High, Clear corners, Hypers, 18's, Aero, tint, Premium.