165.3 + MP70.3 is excellent no need for Xover it's in your DSP already.
You can also plug in a high level mono amp in and add a decent 10 " sub for a huge lift.
Sold my HPP very in Sept for $7K profit got 2023 NOS Bronco 2.7 OuterBanks Lux soft top $12K off added Bilstein coilovers now drives very similar but can do the usual urban 4X4 stuff and no wheel scuffs just love it. Roads too beat up for Mustang for me.
Tempted by a 60th anniversary though.
Pretty sure it still S550/650 unibody which is extremely robust plus all the added weight of mandated track safety equipment, huge wheels, tires, brakes...they only saved maybe 350 lbs max with CF body panels probably closer to 200.....need CF tub to slash weight.
It's not about upgrade turbo which is OE Garrett it's about IC which Garrett IC matches up with perfectly.....anyway need a lot of HP to compensate for extra 200lbs of V8 and the extra 20 lb per wheel, then there's the low end power and which is amazing in 2.3HPP VS rev do 3800 V8 drop the...
I installed Garrett IC on my HPP didn't even have to take bumper off took 45 min weighs maybe 15lb or so.....it's the only kn you know will work seamlessly with HPP turbo / flow rates etc they make the turbo too:)
I did Katzkins direct via their local installer. Fit is very poor so installer stuff more foam in to take out wrinkles killing the seat ventilation and heat by 70% also with mine took them three production runs to finally install the tie down stays on the patterned covers.
Construction...
HPP convertible: B6 on stock springs - wore out after 12 mths very harsh ride tossed them, Koni Special Active on stock springs first set of 4 defective with noisy valves and second set defective as well one of the four replacement has a severely bent strut shaft and valves noisy as...
For back roads stock or HPP or GT PP1 takes offs are best as I learned after three damper packages that I tossed or got refunded. Falken FK510 very good quiet ride and traction in wide temp range.
Note that some amps will equalize high level signals like My Audison AP8.9 and Kenwood XR1001.1 that I just connected to Bronco B&O sub high level works great no more bass roll off.