when i removed my secondaries i got rid of the butterflys and all but two inches of the shaft so i could leave the IMRC in place and not get a check engine light.
i did lose some driveability down low but could fell a gain up top,since then i had my exhaust done and gained more power through the whole RPM band,with this mod my driveabilty has returned to normal.this is still untuned.
i would like to get a 2000 taurus computer and see if i can make it work so i get liner power through the RPM band and not a spike at 3500 rpm.

here is my dyno before and after the exhaust

98 svt sil/blu 3.0 oval heads full P&P, msds headers,bat kit,2,1/2exhaust 30 inch glasspack and 2 spintech mufflers 14.78@94mph with my mechanical arm i can shift gears in less then a twentieth of a second for sale $7000