I sold my old audi 90, and bought an a4!

I bought a silver 1997 A4, 1.8T Quattro 5 speed with sports package. Its got an MTM chip(any good? advertised as 50hp and torque) and a Borla exhaust system. It's also got a K&N airfilter. 144,000 miles. Engine rebuilt due to sludge(recall from audi) 30,000 miles ago and front end completely built 10,000 miles ago.

It's really quick and a blast to drive! But, PLEASE HELP

1. The engine ticks when cold and warmed up. It also ticks while idling and faster when revved. It sound like it's coming from the belts and whatnot from the front more than anywhere else. Is this bad? If so what is it?

2. This is what really concerns me. I can drive my car from start to 5th and wind it out. No problem. But when I'm coasting at 50 and want to go to 65 in 5th, when the turbo kicks in the car hesitates and loses and gains power sporadically until I let off the gas(surging). Slowly accelerating doesn't make the problem happen though. Why?

3. The front left part of my suspension makes popping noises when I go over bumps. The left does not. Whats wrong?

My car is throwing no codes. I've seafoamed it through the crank and gas tank. I run 91 octane gas. It has new mobile 1 oil with a mobile 1 oil filter.

Thanks!

-sobo