Re: au xr6
Pacemakers with high flow cat. If it's a VCT, leave the original twin pipe exhaust from the cats back, but if it's an XR6 HP, then upgrade to 2.5". K&N filter is also worth a shot as well as the T series/BA XR6 Turbo air intake pipe.
Other intake stuff that works well is as per your suggestion - blower/turbo.
AU1 XR8 Auto 147.9 rwkw (approx 215 fwkw)
AU2 Wagon HAD Auto
17s, Pacemakers, 3" Intake & Pod filter (The Family Hack)
FPV-XR Club ACT