... have been weighing up the usual PPP vs. Motec vs. Ecutek equations in my head prior to taking the plunge....

I am currently running TSL Group N back-box and decat centre sections on my MY02 WRX - and would actually quite like to keep both TSL sections in place if I were to get a PPP (lovely 'different' exhaust note from Prodrive items)

Will they do it? Or do they insist on replacing the centre cat sections with the standard items?

Also, would they even consider putting PPP on a car that has already been 'messed' with?

 

The PPP is now a dealer fit option so as long as your dealer is cool then all will be well. In the past the car went to Prodrive and thats where the 'previously modified' problems were.
Chuck