Yeah...I'm torn...the other difference, besides turbos, intake, etc... is the S8 has different cams as well...so even with all the other "bolt-ons", you'll never hit S8 power...but for the money, would it be good enough...?
Current: Black Pearl Metallic Effect/Ebony, RNS-E, Euro + pedals, oCarbon, Hotchkiss Front & Rear Sway Bars, Koni Yellow's
I think just the shape lends the S8 to our eye better than the RS7
there will be some that are drawn to the RS7....but the S8 is more my style.
I drove a '13 A8L with the 4 liter turbo for three years, great car, it did not have all the bells and whistles but had the massage seats! LOL miss those. My dad has a '15 S8 (dayton grey LOL) and loves it. His has ALL the options. If you can get a CPO S8, you'll be very happy. He had the '14 A8L with the sports suspension which was MUCH better than my '13. Once he drove the 4.0 L Turbo his '12 NA was not good enough. He is toying with S8 plus and of course I encourage this purchase.
Mike
'18 BMW M5, '19 Porsche Boxster GTS
(prior '94 325is, '97 M3, '00 A6 4.2,'03 RS6,'08 A4 Cab,'13 A8L,'15 Q7,'16 BMW M2,
I'm also a big fan of the S8, but am not willing to give up the practicality of a folding rear seat.
Gotta put in a plug for the S6. Stock numbers not bad, but great bang for the buck with a tune. Personally, I preferred the look over the S8 and certainly over the 7s, and plenty of room unless you are Driving Miss Daisy and need a larger back seat area.
First RS6 totaled at 142K. Now donor for S6 Avant project. Daily driver: Sepang Blue 2016 S6. Black optics, sport package. #2 Black on Black, Level 10 and Koni, Eclipse Nav + Sirius, 034 Motorsports ECU and TCU tune.