New cats, new power

I had 2 new Magnaflow hi-flow cats put on my truck today ($180 installed), and two things happened. One, my SES light has not come on again (was code P0430). Two, more power. I only downshifted once in 50 miles on route 80, where I used to downshift at least 5 or 6 times. I should have asked to see the old cats - bet they were really shot with 136k miles on them. Now I'm thinking about getting the magnaflow muffler too.

They could have been shot, but the factory cats are very restrictive, even if they weren't bad the new cats would be a lot better. I would change the factory muffler as well they are also very restrictive.

I wonder if new cats would help mine? I always read that the factory cats where not that bad. I have a magnaflow cat back which really helped, you think I would notice new cats also? Are those SS cats? like the factory ones. Seems like a good price, hell I paid like 5 bills for the cat back and did my own install.

I wonder if new cats would help mine? I always read that the factory cats where not that bad. I have a magnaflow cat back which really helped, you think I would notice new cats also? Are those SS cats? like the factory ones. Seems like a good price, hell I paid like 5 bills for the cat back and did my own install.

Yes cats would help a ton, the factory cats are restrictive and they plug easy. If you paid $500 for a magna flow system you got screwed. :banghead:

Well, I priced all the ebay ads and they were in the high 4's, so just ordered from jegs with free shipping it was just over 5 bills. Usually jegs or summit is right on par with others and no worries about gettin screwed on ebay--been there done that. What is a good place to buy?

I got mine at drivewire.com and for two it came out to $122.66 with free shipping. Plus I got 2 denso O2 sensors for $84. Took awhile to get the cats; I think they were backordered.

BTW: SES light it still off, 400 miles later, no pending codes.

Hey I was at a shop and i was checking out those magnaflow hi-flow cats. Do they do anything for sound?? I have a magnaflow muffler on my truck and im trying to get a little more sound out of it. Is there a loss in back pressure?