So which Catback do you like for the GS400
#1
So which Catback do you like for the GS400
Okay so I am now looking to swap out my rear portion of my exhaust system. I currenlty have Borlas connected to the exhaust on the car. We have already removed all the cats and I have a turbo setup on the 400.
I prefer low rumble and louder rather than quiter, In fact I really like the borlas and probably wouldnt be looking to change them out but they are a 2" pipe and the rest of the exhaust is 2.5 inches, so I want to remove the restriction in hopes of better performance
I am almost done
I prefer low rumble and louder rather than quiter, In fact I really like the borlas and probably wouldnt be looking to change them out but they are a 2" pipe and the rest of the exhaust is 2.5 inches, so I want to remove the restriction in hopes of better performance
I am almost done
#2
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Hey Morris. You've been doing some serious work. Can't wait to here more when your done.
I'm paying close attention to exhaust mods related to removing all restrictive catalytic converters plus adding headers jbrady is working on. Whats your take on removing the cats...any available pipes off-the-shelf to do this?
I'm paying close attention to exhaust mods related to removing all restrictive catalytic converters plus adding headers jbrady is working on. Whats your take on removing the cats...any available pipes off-the-shelf to do this?
#3
As far as I know there are no aftermarket test pipes for the GS400.
I had a complete custom exhaust installed for the turbo setup, so we just ran 2.5 inch pipes the whole way. The only thing that I did keep was the borlas and now it looks like I may remove that in favor of a 2.5 cat back
I had a complete custom exhaust installed for the turbo setup, so we just ran 2.5 inch pipes the whole way. The only thing that I did keep was the borlas and now it looks like I may remove that in favor of a 2.5 cat back
#5
Originally Posted by morris
A better question might be if I am alrady at my HP goals, is there any reason to replace the mufflers with a larger diameter catback system, so that all the exhaust piping is the same size?
#6
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Well, i'm sure if all the piping was the same size as the downpipe off the turbos it would help flow rather then fluctuating between small and larger pieces. If you're at your goal though, i guess the only benefit would be helping make boost quicker as the flow would be smoother.
someone with more expeirence with turbos should asnwer though, i have limited knowledge
someone with more expeirence with turbos should asnwer though, i have limited knowledge
#7
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Morris Cat Backs are mass produced systems. If I was you with what you have I would have some build me a Mandel Bent custom system from front to back. Big Diffrence with turbo Car. I know a guy in GA that just Built my system totally for cheaper than a CAT back. If you want the info PM me.
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#8
morris, I'll double check my facts, but dual 2.5 inch cat back should be good for 500 hp IIRC and dual 2 inch ~400hp
Also, GRAND MUFFLER in marietta does AWESOME work. They have a mandrel bending machine.
If you choose to go that route, let me know. I have some info that you need to know
edit... Also in a turbo system you want ZERO back pressure. It helps the turbo spool faster, so I'd go with the 2.5
Most people with single exhuasts use 3-4 inch. So dual 2.5's should work
Also, GRAND MUFFLER in marietta does AWESOME work. They have a mandrel bending machine.
If you choose to go that route, let me know. I have some info that you need to know
edit... Also in a turbo system you want ZERO back pressure. It helps the turbo spool faster, so I'd go with the 2.5
Most people with single exhuasts use 3-4 inch. So dual 2.5's should work
#9
Morris,
A good "guide" is an exhuast 10% larger than the turbine housing.
And 2 2inch pipes can handle approx. 600 BHP. 2 2.5 inch exhaust pipes are good for approx. 800 BHP. ( Using corkey bell as a resource )
I'd go with the 2 2.5 inch system and look at either test pipes or hi-flow cats. BUT, stay away from R/T ( random Tech) cats. They come apart on the inside
A good "guide" is an exhuast 10% larger than the turbine housing.
And 2 2inch pipes can handle approx. 600 BHP. 2 2.5 inch exhaust pipes are good for approx. 800 BHP. ( Using corkey bell as a resource )
I'd go with the 2 2.5 inch system and look at either test pipes or hi-flow cats. BUT, stay away from R/T ( random Tech) cats. They come apart on the inside
#10
Originally Posted by morris
Can anyone help me with this question?
With my turbo sr 240, i ran without a down pipe and exhaust, just a dump pipe off the turbo once......insta' spool yo!!!!
#11
Heck I've been so busy with work this past week that I forgot about this thread
After reading the numerous posts on the subject of catbacks, and now the technicall information so nicely provided, I have decided to go with the Greddy EVO2. I found a price of 729 on the NEt so I will go ahead and order it. I am sort of holding off till my car gets closer to completion (engine build that is). It seems that the pistons are a problem and the date has been pushed back quite a bit. I already have several thousand dollars tied up in the engine rebuild deposit and I dont want to tie up any more cash needlessly till I know I will get to drive it relatively soon.
Dr G has made a few posts about how happy he is whith the Greddy and his opinion carries a lot of weight with me.
Thanks guys..
After reading the numerous posts on the subject of catbacks, and now the technicall information so nicely provided, I have decided to go with the Greddy EVO2. I found a price of 729 on the NEt so I will go ahead and order it. I am sort of holding off till my car gets closer to completion (engine build that is). It seems that the pistons are a problem and the date has been pushed back quite a bit. I already have several thousand dollars tied up in the engine rebuild deposit and I dont want to tie up any more cash needlessly till I know I will get to drive it relatively soon.
Dr G has made a few posts about how happy he is whith the Greddy and his opinion carries a lot of weight with me.
Thanks guys..
#14
BORLA by FAR the best
especially if you dont want a total ROAR from the exhaust but want a really *****en mellow but meaty tone...
after tying Hiper/Blitz/Tanabe/Megan etc... the Borla is by far the best on my car.
especially if you dont want a total ROAR from the exhaust but want a really *****en mellow but meaty tone...
after tying Hiper/Blitz/Tanabe/Megan etc... the Borla is by far the best on my car.