For the first mod to my stock gtp i was thinking of getting SD headers

(STAINLESS SS RACING MANIFOLD HEADER/EXHAUST GRAND PRIX/GTP/REGAL/IMPALA 3.8L V6 | eBay)

I was thinking this would be smart since later on in the future i want to run a 3.4 set up, reading up alot on how kr is the biggest problem these cars run into.

Also, will this keep me free from kr on a 3.4 setup?