[mikedsilva]

I'm glad this thread has just come about....
Recently, I bought a 964 in total stock condition...

First mod was to drill out the lid of the airbox... I ended up cutting a large opening in it.. Result was no extra noise until I really opened the throttle.. then I would get that nice deep throaty roar.. sounded great.. but wasn't enough.

Next mod was to buy a cup pipe. I bought one from Ebay... **********...
Easy install...
I was expecting the car to sound loud when I started it... but I was surprised how quiet it was at idle. In effect, at idle, the volume is hardly any different.. when driving though, the car now has a very pleasant note. Not loud but very "colourful"... Sounds like a nice porsche should sound.

My next options, are to consider the cat bypass and or g pipe. Assuming, I have all 3 components, would you run them all at the same time?

I've been told that a cat bypass, stock primary, and g pipe, give a loud note and best combo of performance...

Do these engines "need" backpressure at all?