Magnaflow Cat-back
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Teching In
Joined: May 2004
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From: Louisville, KY
Magnaflow Cat-back I WAS JUST WONDERING HOW THE MAGNAFLOW CAT-BACK WOULD SOUND ON MY 2000 Z-28. I AM ABOUT TO INSTALL A HIGH FLOW CATALYTIC Y-PIPE BUT OTHER THAN THAT IT'S STOCK. HOW LOUD WOULD IT BE AND HOW WELL DOES IT FLOW IN COMPARISON TO SOME OF THE OTHER CAT-BACKS OUT ON THE MARKET. I CURRENTLY HAVE THE SLP LOUD MOUTH BUT I'M STARTING TO GROW TIRED OF IT. I WOULD APPRECIATE ANY FEEDBACK YOU COULD GIVE ME. 
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Joined: Nov 2003
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From: MD
Originally Posted by davered00ss
I have the Magnaflow and it sounds great. Real musscle car tone. Screams at WOT. I did however lose 10rwhp with the magnaflow vs. the stock SS exhaust.
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I had a Loudmouth... then I added long tubes and ORY. 
I had to get rid of the Loudmouth at that point. I went with the Magnaflow and I have to admit - it sounds AWESOME, but I did lose power with the Magnaflow over the LM. It seems to be choking my motor out above 4600RPM where as the LM flowed right up to 6K... However, I assume it MUST flow better than our stock exhausts... I will be adding an electric cutout to solve the flow problem at the track! 
I had to get rid of the Loudmouth at that point. I went with the Magnaflow and I have to admit - it sounds AWESOME, but I did lose power with the Magnaflow over the LM. It seems to be choking my motor out above 4600RPM where as the LM flowed right up to 6K... However, I assume it MUST flow better than our stock exhausts... I will be adding an electric cutout to solve the flow problem at the track! 
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Joined: Feb 2004
Posts: 552
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From: Naperville, IL
Originally Posted by davered00ss
I have the Magnaflow and it sounds great. Real musscle car tone. Screams at WOT. I did however lose 10rwhp with the magnaflow vs. the stock SS exhaust.
NOT POSSIBLE! Do you have a clogged cat?
my mods are in my sig, all i did was add the magnaflow, slp lid, and home ported the TB and MAF and i gained six tenths...yes, just on those mods...and it sounds great too...the only other way i would have it is true duals
Originally Posted by INMY01TA
A high flow catted Y pipe would be a waste of money. WHY ARE YOU SHOUTING?
hahahaha
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Joined: Jan 2003
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From: Northern Va
To try to answer your question- I recently installed a catted RT Y after running just a Magnaflow muffler. It sounded great with the Magnaflow but after installing the Y it sounds even better (and a little louder).