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Discussion Starter · #25 ·
One of the biggest turbo killers is running higher boost pressure with increased backpressure. The higher backpressure comes from using the stock Y-pipe and intermediate pipe, iirc, is only 1.75" diameter in places. Therefore, while using the LDPs in place of the secondary cats is a step in the right direction, I'd recommend a 2.5" dia.-piped CBE to lower the backpressure on the turbos.
I meant to write I have a Helmholtz mufflers axleback setup.. do you believe I still need a CBE?
 

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I meant to write I have a Helmholtz mufflers axleback setup.. do you believe I still need a CBE?
I do. Pushing 17+ lbs of boost through the soda straw OEM mid-pipes is not the most efficient way for making power, and it's generally not good for turbo (seal) longevity.

It sounds like you are worried about how loud your exhaust would be. I'd say your best bet for reasonable sound levels is the Fast Intentions CBE, with Resonators and 14" Touring Mufflers. This is the same CBE config I have on my '17 Q60 Red Sport AWD for the past 5 years:

Q60 3.0L FI CAT BACK EXHAUST | Fast Intentions

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It's a great combination - you'll hear it when you "give it the beans", but I can highway cruise all day with the wife and she doesn't complain about the noise at all. In fact, when I had the stock Dunlop Runflats, they made more acoustic noise at highway speeds than the exhaust!

The only downside is the FI order lead-time is 12+ weeks (or so).
 

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One of the biggest turbo killers is running higher boost pressure with increased backpressure. The higher backpressure comes from using the stock Y-pipe and intermediate pipe, iirc, is only 1.75" diameter in places. Therefore, while using the LDPs in place of the secondary cats is a step in the right direction, I'd recommend a 2.5" dia.-piped CBE to lower the backpressure on the turbos.
That's an interesting comment. I did not know that upgrading the exhaust system would help with the turbos longevity while using JB4.
 

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I do. Pushing 17+ lbs of boost through the soda straw OEM mid-pipes is not the most efficient way for making power, and it's generally not good for turbo (seal) longevity.

It sounds like you are worried about how loud your exhaust would be. I'd say your best bet for reasonable sound levels is the Fast Intentions CBE, with Resonators and 14" Touring Mufflers. This is the same CBE config I have on my '17 Q60 Red Sport AWD for the past 5 years:

Q60 3.0L FI CAT BACK EXHAUST | Fast Intentions

View attachment 25905


It's a great combination - you'll hear it when you "give it the beans", but I can highway cruise all day with the wife and she doesn't complain about the noise at all. In fact, when I had the stock Dunlop Runflats, they made more acoustic noise at highway speeds than the exhaust!

The only downside is the FI order lead-time is 12+ weeks (or so).
I was told it takes 2 to 4 weeks max now instead of 12.

Also I was wondering how long would it take to install the CBE & LDP, on average? I asked at my dealership they told me at least 10 hours as they have to take the engine out for the LDP.

Another super cars shop specialized in tuning and modding cars called Auto Devenzo in Laval, Quebec told me it would take approx 6 hours give or take.

Is the dealership trying to rob or the other shop trying to sell? Both have got the same rate per hour apparently.
 

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You do not need to take the engine out to install LDP's, that dealer is being ridiculous.
 

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Also I was wondering how long would it take to install the CBE & LDP, on average? I asked at my dealership they told me at least 10 hours as they have to take the engine out for the LDP.
Back in 2017, with my Corvette buddy and his 4-post lift, us "amateurs" installed the LDPs & CBE in 4-5 hours, taking our time. When disconnecting the secondary cats from the primary cats, accessing from engine compartment, you need a long extension and a swivel to remove the studs, as they are slightly angled toward the firewall, and you don't want to round-off the nuts. The other challenge was getting the RH O2 sensor disconnected and reconnected, as the pigtail connector is close to the transmission.
 
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