Shorty vs LT Headers
#11
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For the 5.7 I think the inlet is 2.5 and the outlet is 3. I'm not 100%. But it all depends on what muffler you get. You need 2 in (one pipe from each header to the Y) and then 1 out (Hence "Y" pipe) for a typical muffler. If you're doing true duals then you would need an H pipe or an X pipe
#12
#13
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No no. You would only have to cut out the stock Y pipe and weld in the new one. Any muffler or exhaust shop should be able to get it in there
Here's a pic of it installed:
http://i966.photobucket.com/albums/a...Mamba/Y-04.jpg
Here's a pic of it installed:
http://i966.photobucket.com/albums/a...Mamba/Y-04.jpg
#15
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You could do as I did and do away with the y pipe altogether. Get the muffler shop to come straight from the cats, with two 2.5 inch pipes to the muffler location then use a dual in dual out muffler and dual tailpipes. Works great and no h or x pipe is needed. I did have a x pipe muffler at one time, but see no change since I replaced it with a regular dido muffler
#16
#17
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It's definately louder than stock, but I believe when mine got the loudest was when I replaced the stock cats with magnaflow hi flow spun converters. The stock cats are very restrictive compared to the magnaflows. I have shorty headers from BBK but they didn't make it louder than stock, until I added the hi flo cats. You can buy a dido muffler for around 50.00 or less, and you will get better exhaust flow from using two pipes than the 2 into 1 that comes from the factory, and depending on what muffler you use, it should be louder than what you have. Good Luck
#18
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It's definately louder than stock, but I believe when mine got the loudest was when I replaced the stock cats with magnaflow hi flow spun converters. The stock cats are very restrictive compared to the magnaflows. I have shorty headers from BBK but they didn't make it louder than stock, until I added the hi flo cats. You can buy a dido muffler for around 50.00 or less, and you will get better exhaust flow from using two pipes than the 2 into 1 that comes from the factory, and depending on what muffler you use, it should be louder than what you have. Good Luck
#19