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  #1  
Old 01-22-2010, 01:23 PM
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4.7 H.O. mini catalytic converter replacement

I have an 04' with the HO and want to replace the mini catalytic converters underneath. I currently have a 40series flowmaster that sounds good but when i hit higher RPM's it seems to quiet down a bit. What do you guys think is the best high flow mini cats? Any other suggestions?
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04' Freedom Edition, 4.7 H.O., flowmaster 40 exhaust, semi de-badged, superchips perfomance 91 tune, K&N 57 series FIPK,
FlyinRyan Ported TB, daystar leveling kit, 4" ZONE lift with BDS front upper control arms, Tom Woods custom front driveshaft, IROR adjustable rear A-arm, IROR rear lower control arms, Addco rear 1" sway bar, 32" Grabber AT2's.
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Old 01-22-2010, 05:04 PM
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Re: 4.7 H.O. mini catalytic converter replacement

I use the Thunderbolt metallic substrate cats. they cost 63 shipped from Performance Curve , you need the 2" in/out ones.
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Old 01-23-2010, 08:22 AM
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Re: 4.7 H.O. mini catalytic converter replacement

Thanks. Did you notice any gains or louder exhaust? I think you have me sold on them.
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04' Freedom Edition, 4.7 H.O., flowmaster 40 exhaust, semi de-badged, superchips perfomance 91 tune, K&N 57 series FIPK,
FlyinRyan Ported TB, daystar leveling kit, 4" ZONE lift with BDS front upper control arms, Tom Woods custom front driveshaft, IROR adjustable rear A-arm, IROR rear lower control arms, Addco rear 1" sway bar, 32" Grabber AT2's.
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Old 01-23-2010, 08:30 AM
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Re: 4.7 H.O. mini catalytic converter replacement

I just gutted mine LOL. NO more replacey....... EVER!!!!!!!!!
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Old 01-23-2010, 08:46 AM
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Re: 4.7 H.O. mini catalytic converter replacement

I about to roll over to 80k. Not sure I want to gut them just yet. lol how did your jeep sound after that?
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04' Freedom Edition, 4.7 H.O., flowmaster 40 exhaust, semi de-badged, superchips perfomance 91 tune, K&N 57 series FIPK,
FlyinRyan Ported TB, daystar leveling kit, 4" ZONE lift with BDS front upper control arms, Tom Woods custom front driveshaft, IROR adjustable rear A-arm, IROR rear lower control arms, Addco rear 1" sway bar, 32" Grabber AT2's.
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Old 01-24-2010, 04:40 PM
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Re: 4.7 H.O. mini catalytic converter replacement

If you gut your cats it'll be loud all to be damned! You need to be able to handle LOUD all the time.

Isn't a plus if its shuts up while cruising tho?
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Old 01-25-2010, 03:01 PM
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Re: 4.7 H.O. mini catalytic converter replacement

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Originally Posted by dreamer1213 View Post
If you gut your cats it'll be loud all to be damned! You need to be able to handle LOUD all the time.

Isn't a plus if its shuts up while cruising tho?

I'll have to live with it, I need the flow.
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Old 01-25-2010, 07:17 PM
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Re: 4.7 H.O. mini catalytic converter replacement

The big thing I want is flow, but not too loud. I like it somewhat quiet when i'm cruzzin, but loud when i'm gettin on it. I think i'm going to get the Thunderbolt metallic substrate cats and leave it at that. Trying to find that happy medium is the hard part.
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04' Freedom Edition, 4.7 H.O., flowmaster 40 exhaust, semi de-badged, superchips perfomance 91 tune, K&N 57 series FIPK,
FlyinRyan Ported TB, daystar leveling kit, 4" ZONE lift with BDS front upper control arms, Tom Woods custom front driveshaft, IROR adjustable rear A-arm, IROR rear lower control arms, Addco rear 1" sway bar, 32" Grabber AT2's.
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Old 01-25-2010, 07:18 PM
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Re: 4.7 H.O. mini catalytic converter replacement

Thanks for your input guys!!!!!!
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04' Freedom Edition, 4.7 H.O., flowmaster 40 exhaust, semi de-badged, superchips perfomance 91 tune, K&N 57 series FIPK,
FlyinRyan Ported TB, daystar leveling kit, 4" ZONE lift with BDS front upper control arms, Tom Woods custom front driveshaft, IROR adjustable rear A-arm, IROR rear lower control arms, Addco rear 1" sway bar, 32" Grabber AT2's.
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Old 01-25-2010, 11:39 PM
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Re: 4.7 H.O. mini catalytic converter replacement

Quote:
Originally Posted by nwb300 View Post
The big thing I want is flow, but not too loud. I like it somewhat quiet when i'm cruzzin, but loud when i'm gettin on it. I think i'm going to get the Thunderbolt metallic substrate cats and leave it at that. Trying to find that happy medium is the hard part.
I hear you there. I changed my setup 5 or 6 times until I found a setup I was truly happy with. I run 3 of those thunderbolt metallic cats (2 in the Y pipe, 1 3" main cat) and a 4x14 Magnaflow round resonator behind that, into a 3" pipe out the rear. Sounds great when cruising, LOUD at WOT, and I get a ton of compliments on it. Now if only my girlfriends didn't complain about it.
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