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jzdinan540i
08-07-2003, 10:55 AM
I had the stock cats swapped out for the hi-flows yesterday and there was a slight increase in power, and a little lower exhaust note. I am sure things will change after the break-in period.
bmw540i
08-07-2003, 12:31 PM
I had the stock cats swapped out for the hi-flows yesterday and there was a slight increase in power, and a little lower exhaust note. I am sure things will change after the break-in period.

How much did you pay if you dont me asking. Are you seeing the gains on a dyno if so can we see the graph.
jzdinan540i
08-07-2003, 01:24 PM
How much did you pay if you dont me asking. Are you seeing the gains on a dyno if so can we see the graph.

I have never dynoed the car,so I have no clue what the actual number is. However, it is about as much as you would see from a CAI or cat back mod. I have heard many say 15HP, but I would say 3-5 max.
The parts were about 80 a peice for the finished cats and about another $150 in labor. Its about a 45 min job for a good welder, but the stock cats have a slight bend in the front, so this required some cutting and custom welding.
I am not thrilled with the hack job :), but it works untill a different shop has the time to do clean up.
bmw540i
08-07-2003, 03:21 PM
I have never dynoed the car,so I have no clue what the actual number is. However, it is about as much as you would see from a CAI or cat back mod. I have heard many say 15HP, but I would say 3-5 max.
The parts were about 80 a peice for the finished cats and about another $150 in labor. Its about a 45 min job for a good welder, but the stock cats have a slight bend in the front, so this required some cutting and custom welding.
I am not thrilled with the hack job :), but it works untill a different shop has the time to do clean up.

Can you give me the web site you bought it from THanks. Does it make the exaust note a little louder or no.
jzdinan540i
08-08-2003, 05:20 AM
Can you give me the web site you bought it from THanks. Does it make the exaust note a little louder or no.

It does get deeper, the website is listed in my other Cat thread. If you can't find it email me.