[url]http://cgi.ebay.com/ebaymotors/99-04-FORD-MUSTANG-V6-3-8L-OBX-CATBACK-CAT-BACK-EXHAUST-/330505566567?pt=Motors_Car_Truck_Parts_Accessories&hash=item4cf3aab967[/url]
[url]http://cgi.ebay.com/ebaymotors/MAC-exhaust-catback-Mustang-3-8-3-8l-99-04-v6-4-0l-4-0-/330505547577?pt=Motors_Car_Truck_Parts_Accessories&hash=item4cf3aa6f39[/url]
Well, stainless is always better than aluminized because it will usually last decades vs. aluminized which will last for maybe a decade. Stainless also looks better.
The 2 systems you're looking at look like complete bolt on exhausts but the OBX has smaller mufflers. The MAC has larger ones. I'd say the OBX would naturally be louder but it's not possible to tell by looking at them. If you want it to be as loud as you can get then the OBX is the way to go. If you want a quieter exhaust than the MAC might be better. They probably both have a completely different sound/tone to them as well.
Magnaflow and Pypes also make full stainless systems for under $500. OBX isn't as well known as Magnaflow but who knows what the "better" system is. AllFordMustangs.com is a good place to search for people's comments on particular systems.
04-06 Toyota Scion xA OBX 2.25" Catback Exhaust System, OBX SS304 EXHAUST CATBACK 97-01 SUBARU IMPREZA 2.5RS, OBX Catback Exhaust 01-05 Audi Quattro A4 3.0L V6 System Cat Back, OBX Catback Exhaust 88-91 Honda CRX Type-H Stainless, OBX CATBACK EXHAUST SYSTEM 01-04 VOLVO T5 V70 2.4T 2.5T, OBX CATBACK CAT BACK EXHAUST 99-04 FORD MUSTANG V6 3.8L, OBX CAT BACK EXHAUST 97-01 AUDI A4 B5 QUATTRO 30V NEW, OBX CATBACK EXHAUST SYSTEM 01-04 AUDI TT 1.8L QUATTRO, OBX Catback Exhaust 00-03 Nissan Maxima V6 NEW , OBX Catback Exhaust Porsche 944 83-91 2.5L 2.7L 3.0L, OBX EXHAUST CATBACK 01-05 BMW 325I 325CI 330I 330CI ALL, OBX Catback Exhaust System 02-06 Nissan Altima 2.5L L4, OBX Catback Exhaust JDM 94-99 Celica GT4 ST205 Turbo, OBX Catback Exhaust 07-09 MINI Cooper S Cat Back R56, OBX Catback Exhaust 05-08 Chrysler 300C 5.7L V8 HEMI, OBX 3.5" Catback Exhaust System 93-98 Toyota Supra 3.0L Twin Turbo 2JZ-GTE JZA80, SOLARA 99-02 V6 TRD OBX SS304 EXHAUST CATBACK SYSTEM , 02-05 Audi A4 Cabriolet Quattro S4 B6 1.8T OBX Cat back, Honda Accord 03-07 V6 2DR OBX Catback Exhaust System, OBX 00-05 LEXUS IS300 CAT BACK CATBACK EXHAUST SYSTEM AXLE BACK 2" 4.5", NISSAN 350Z DUAL RACE OBX CATBACK EXHAUST SYSTEM X PIPE, OBX Catback Exhaust 07-09 Honda CRV Cat Back 2.0", 03-09 VOLVO XC90 2.5T T6 V8 QUAD OBX CATBACK EXHAUST 2", OBX RACE CAT DELETE CATBACK EXHAUST SYSTEM 00-08 HONDA S2000 RACING S2K, OBX Catback Exhaust System Honda Accord 03-07 TYPE H 3P, OBX MITSUBISHI ECLIPSE RS GS 95-99 B3 CATBACK EXHAUST SYSTEM TYPE R, OBX Catback Exhaust Kit 01-May 04 Volvo V70 FWD 2.4T 2.5T T5 , OBX PRO-SERIES 90-97 Mazda Miata 1.8L DUAL TIPS CATBACK EXHAUST DOWNPIPE SYSTEM, Honda Accord 03-07 4cyl OBX Catback Exhaust System, OBX Catback Exhaust 01-04 Volvo V70 Turbo AWD 2.4T 2.5T D5, OBX DUAL TURBO CATBACK EXHAUST SYSTEM 94-99 DODGE NEON 2.0L 420A 2DR 4DR, OBX Catback Exhaust 01-05 Audi Quattro A4 3.0L V6 , MAZDA MIATA 89-97 NA6(8)C OBX DUAL TIP CATBACK Exhaust, OBX HIGH POWER EXHAUST CATBACK SYSTEM 00-05 TOYOTA CELICA GT FOR 1ZZ ENGINE, OBX CATBACK RACE EXHAUST SYSTEM 01-04 VOLVO V70 2.4T 2.5T T5 FWD, OBX Catback Exhaust 00-05 Mazda Protege 5 Cat Back, OBX Exhaust Catback System Corolla AE86 85-87 GTS, OBX Cat back Exhaust System 00-03 Nissan Maxima V6, OBX Catback 04-06 RX8 FE3S Clamped Canister Exhaust, OBX Catback 97-01 EVO 4 5 6 Lancer Stainless Exhaust, OBX Catback 04-08 Mazada *All Cat Back, 00-04 Ford Focus ZX3 Zetec OBX Catback Exhaust System, OBX Catback(CTR) 01-04 Honda Civic 2 drs LX DX SV005, OBX Catback 94-99 Integra GS-R Cat Back SV005 Stainless, OBX Catback 98-02 Accord 4 Cycl 2/4dr Stainless Steel, OBX Catback 92-96 Prelude 2.0 2.2 S Vtech Exhaust, OBX Catback 00-05 Mazda Protege 5 Stainless Steel, OBX Catback 98-02 Accord 4cyl 2/4drs F23A Exhaust SV005, OBX Catback 03-07 Mitsubishi Evo Evolution 8 9 Cat Back, OBX Catback 06-09 Nissan Versa 1.8L 5drs Exhaust,
