Tires & Perf options

[Peter Toombs]

New RR owner of a HSE 2004 with 50k. Original tires, Goodyear wrangler with the typical problems of cupping.
I am considering MIchelin Syncrones or Michelin Latitude Tour HP. Original spec dictates 255 55 R19 for an overall DIA of 30. I would like to go to an overall DIA of 31" to 31.5". Any experience of this larger tire application in so far as type and model, warranty, adjusting trip computer etc?
I am considering an after market air intake kit for a little more performance and better fuel mileage, any suggestions on this or other obvious performance enhancements at the lower price points?

 

[97rover]

Well If you put larger tires on than manufacture recommends there goes your fuel economy. K&N air intake is better for pony's and pretty equal for fuel. As far as better fuel ecnomy bottom line sad to say buy a little car.

 

[Peter Toombs]

THX for the comments.
PT