Hey guys,
One quick question, will the following offset fit my TF Magna?

Tyres- YOKOHAMA 245/35/ZR19

Rims are + 38 + 40 offset

Stud pattern- 5 x 114.3 pcd

I believe so. You will have troubles with the tyres rubbing on the guards, so your guards will need to be rolled, but they'll still probably hit.

Get 235/35/R19s and you wont have any rubbing problems

Get 235/35/R19s and you wont have any rubbing problems
If you go 235 in 19's I think 35 is the right profile isn't it. If you wanted 245 wouldn't you need to go down to a 30 profile? I remember there was a site to calculate all this.

well, these are not brand new so thats the size for sale. So if I put them on I'll have to get the guards rolled and will still have rubbing issues?

If you go 235 in 19's I think 35 is the right profile isn't it. If you wanted 245 wouldn't you need to go down to a 30 profile? I remember there was a site to calculate all this.
This is a good calculator: http://1010tires.com/TireSizeCalculator.asp

the offset is wrong forget the rolling diameter for a min.... magnas are +46 +38 will stick out too far on the front and look stupid and the rear will rub if lowered a reasonable ammount