loss of high end power
 

NeSo recently i started driving my 8 again i just put on a exotic speed exhaust and k and n typhoon intake and power just stops at 7 grand the car wont even get to 9 i replaced the spark plugs 30 miles ago thinking that was the problem but its still the same thr car runs and drives fine till about 6 to 7,000 rpms any suggestions?

Coils? Cat? Search?

K&N Typhoon = junk. Put the stock one back.
Do a compression test while you're at it. If you still have a cat check that as well.
Also check your intake manifold's valves.

MAF could be getting wrong reads at higher rpm's from the k&n filter. best to go to stock.