Im running volk se37k 17x9.5 +40 rear 255 40 tire
Arches rolled flat
trimmed and relocated bolt
still rubs on bumper
gunna trim it some more

 

That's pretty crazy stance man!

 

The bottom line if is you want an even semi-flush fitment on a lowered car then you will need to roll your fenders. It's up to you how much work you want to do and if you want to run staggered or non-staggered. Personally, I am running 225/45 front and 255/40 rear on the 9" +45 RFP1 and I think it is the best option for staggered fitment. I have run everything from a 225 to a 275 on a 9" wheel and honestly the 225 is hardly even a noticeable stretch. Non-staggered, you could do either 245/40 or 255/40 all around. Here is a pic, front fender tweak was due to a different wheel/tire setup:

 

Are your wheels 17x9 all around or 17x8 up front?

 

His are 17x9 all around. He's a local to me.

 

Think I could get by with the same wheel setup and 245/40 fitment without fender mods? maybe lowered just slightly

 

No.

Need to keep the offsets to +55 or higher depending on the width of the wheel together with running only a 225 up front. Any tire wider than a 225 is prone to catching the fender without a roll.