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Discussion Starter #1
Hello i've kinda been searching around this site a little, but havent quite found what i'm looking for. I have a couple questions... When you guys put high flows on you 4.6 T-Bird was there a noticeable increase in sound? Also can you feel a gain in power? Can anyone direct me in the right direction to dimensions of the proper cat size for 2.25" piping. I have found that many memebers said that a 4" overall diameter is a good size to get? is that true? Thanks alot
 

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MN12 Fanatic
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Yes you will get a increase in sound.

But you will only get like 3-5hp when going with high flow cats. Nothing drastic, or something you are going to "feel". But hey, every little bit counts...lol.

If you have 2.25" piping than just make sure you get cats with that size inlet/outlet. 4" overall around sounds fine.
 

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full line exhaust is a good site for custom exhaust (fle-online.com) I just got true duals on my bird with high flow cats the other day and I got everything on there. If it helps the cats i got that came recomended were the 53000 series, specifically part number 53005. I replaced the entire exhaust so I felt a large difference therefore i dont know how much the cats did, but those cats are great. Hope this helps
 

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Discussion Starter #4
Arent there O2 sensors on the stock cats? If so those magnaflow 53005's do those come with 02 bungs? Thanks... Also can anyone elaborate on the sound increase. Is it very noticeable? As in as an example if my friend took my tbird put high flow cats on the downtubes without me knowing... and then I start my car the next day (not knowing at all that there are high flows installed), would i PROBABLY notice it? Or is it somehting that i'd most likely shrug off? (sound) Thanks alot
 

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leet sauce
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have you ever thought of going straight pipes?
i thought all getting an exhaust system and it ends up being kind of expensive after labor of installing it.

what im planning on doing is getting a chip from loonie which turns off end cats and getting my muffler shop to cut off cats and put in a straight pipe instad of them. i can always put cats back in right before the inspection as they promised to install bolts so i can swap them myself. that way you get a tune, way better sound and engine breathes better for same or a little more $ invested vs just highflow cats.
i dont know if that will help you tho.
 
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