removing cats. Hp gain?
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Joined: Apr 2002
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From: Switzerland
Mercedes Evo II
removing cats. Hp gain?
hi amg fans. To the people that removed or modified their catalytic convertor. How many hp did you gain? Did you also modify the ecu? Thanks in advance
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Joined: Jan 2009
Posts: 668
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From: NY
'03C32 Obsidian Black, '76Toyota Celica GT TRD, '12R350 4matic Arctic White, '06 ML 350 arctic white
removed my secondaries. Butt dyno says yes!!! and the exhaust sounds so much better w/o drone given that you keep the resonator on.
MBWorld Fanatic!
Joined: Oct 2006
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02 C32 AMG
which cats? primaries or secondaries?
on C55, deleting your secondaries is good for 5-10 whp/tq. On a C32, deleting the secondaries will add zero power and make your exhaust louder
for the primaries on a c32, you likely won't see very much gain from removing/switching to high flow primary cats UNLESS you have hearders since the stock exhaust manifolds are very restrictive and are the bottleneck. I don't recall the numbers for deleting/switching to high flow primaries on the C55 but i'm sure they're worth something
on C55, deleting your secondaries is good for 5-10 whp/tq. On a C32, deleting the secondaries will add zero power and make your exhaust louder
for the primaries on a c32, you likely won't see very much gain from removing/switching to high flow primary cats UNLESS you have hearders since the stock exhaust manifolds are very restrictive and are the bottleneck. I don't recall the numbers for deleting/switching to high flow primaries on the C55 but i'm sure they're worth something
Super Member
Joined: Jan 2009
Posts: 668
Likes: 17
From: NY
'03C32 Obsidian Black, '76Toyota Celica GT TRD, '12R350 4matic Arctic White, '06 ML 350 arctic white
which cats? primaries or secondaries?
on C55, deleting your secondaries is good for 5-10 whp/tq. On a C32, deleting the secondaries will add zero power and make your exhaust louder
for the primaries on a c32, you likely won't see very much gain from removing/switching to high flow primary cats UNLESS you have hearders since the stock exhaust manifolds are very restrictive and are the bottleneck. I don't recall the numbers for deleting/switching to high flow primaries on the C55 but i'm sure they're worth something
on C55, deleting your secondaries is good for 5-10 whp/tq. On a C32, deleting the secondaries will add zero power and make your exhaust louder
for the primaries on a c32, you likely won't see very much gain from removing/switching to high flow primary cats UNLESS you have hearders since the stock exhaust manifolds are very restrictive and are the bottleneck. I don't recall the numbers for deleting/switching to high flow primaries on the C55 but i'm sure they're worth something
..... but the exhaust note it produces makes it all worth the $120 in labor and ss pipes 
. now i'm debating on removing the resonators as well. so i'm on the 
fence.
MBWorld Fanatic!
Joined: Oct 2006
Posts: 4,856
Likes: 4
02 C32 AMG
but if you love the sound, then clearly it was worth the money
Last edited by jturkel; Jul 27, 2012 at 07:21 PM.
