As mentioned earlier in this thread, I owned a MK5 R32 back when they first came out...
The noise was intoxicating, especially with the 'flapper' mod done, but with that noise came the incessant need to stamp on the loud all the time to hear it, and that resulted in single figure MPG figures around town.
It was a good motorway cruiser and general 'thug', but the engine was let down by a lack of low down grunt and it made the MK5 very nose heavy.
The sad reality is that VW knew this, but at the time they only had one other option due to FSi being needed for emission regs. The 3.6 found in the Passat was FSi, but the 3.2 wasn't which is why it was phased out.
VW did manage to shoehorn the 3.6 into a MK5, and they created this RSI concept, but it never made it into production as sales of the R36 flopped and it became clear people were moving away to Turbo'd cars (in part due to the MK5 GTI's success)...
It's 13yrs since I had the R32, but I can still recall how badly it handled in corners, and it's no exaggeration to say the 7.5 will feel like a rocket ship in comparison, it's light years ahead of the R32 regards to handling, usable power and feel. OP, you will not regret your decision. IIWY i'd still try and mothball the R32 if you can, I think an unmolested MK4 R32 will be a future classic regards values.