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The stock main cat has flanges, and the magnaflow one has slip-on pipes. Also, the inlets and outlets are different sizes. You won't be able to use it without modifying the rest of your exhaust system. What I did was cut the pre-cats after the first 45* bend, and cut the midpipe just in front of the resonator (get rid of the small bend behind the main cat). Then I used 2" flex pipes from the pre-cats into the Magnaflow, and a small piece of 2.5" pipe from the back of the cat to the resonator. You'll need adapters as well, but I can't recall the size offhand.
I'll have my car up on jackstands tomorrow, I can take pictures if it will help.
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Chris
92 Ebony Mica LS-L " A Rolling Restoration": 223,250 KM - Sleeping
2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos
2008 Subaru Legacy Spec B - Diamond Grey Metallic - Sold
2020 Ram 1500 Longhorn - Red Pearl
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