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I find it hard to believe that having aftermarket mufflers would ruin the plugs. If anything, if the mufflers flow free, it should help w/ less carbon fouling.
It sounds like you're having the dealership replace the plugs. If not, you can get NGK Iridiums plugs from Autozone for like $7. There are a few threads of debates about using the factory version vs the aftermarket version...mostly being that the dealership NGK/Bosch platinums last 100k but put out less power, while the aftermarket plugs put out more power at the expense of only last like 60k.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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