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  On 27/05/2010 at 12:50 AM, GR8XR6 said:

Is there any other makers for a 4" system other than nizpro?

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We make a 4inch BA BF system, but only in-house on the car... there's such tight clearances with 4inch pipe that there can be all sorts of rubbing/banging issues when not made on the actual car... made to any spec- street or race ect.

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  • Moar Powar Babeh
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Sorry Chris,

I wasnt aware you did exhausts,(post edited) Shame you only do them in house, Im in the market for a 4" system for my Sedan at the moment.

  On 27/05/2010 at 1:50 AM, osonvs said:

:innocent::bowdown::bowdown: hiddeous, now your talking my language. Yes 4 speed auto. Ill only be putting exhaust on when I put the other mods on. So I only need to get one tune afterwards. What would you suggest being the best option? The SMB or the stealth? Id buy new mufflers to replace the old ones if I bought the SBD. What price would I be looking at for an auto upgrade? I think I am more worried about the diff and drive shafts buggerin out before the auto ha

In all honesty i would go BF Dump, Bigger cat and leave the rest as is, Or get the stealth system, Your going to have to spend big on the 4 speed if you want it too last. Dont worry about the diff/driveshaft (unless the car is stupid low) they will outlast your auto at the power levels your talking. Why would you replace the mufflers??

EDIT: Look up X-Force systems, they would be good for what you want

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  On 27/05/2010 at 1:58 AM, RAP1D said:

We make a 4inch BA BF system, but only in-house on the car... there's such tight clearances with 4inch pipe that there can be all sorts of rubbing/banging issues when not made on the actual car... made to any spec- street or race ect.

Chris is spot on I have a custom 4" system and it is as tight as a Nun's nasty hence why it was custom and not a straight bolt up

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why a BF dump??? What sort of work on the auto would I be wanting to do??? I suppose a manual would cost more to make it last?? Car is @ 100,000km nearly so I would have thought diff/drive shaft would nearly be stuffed. The mufflers on the car at the moment blast exhaust in one end, back up towards the motor in the middle, then back out the exhaust. May as well just get a straight through exhaust, more free faster flowing. Car is only about an inch lower than standard I have just heard that diffs and drive shafts break alot. I dont like exforce, anyone know of any others?

4" dump, race cat and new faster flowing mufflers should do it eh? no point in replacing my exhaust with another 2 x 2.25" pipes when they are already there lol

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Over/through the diff cradle is where is REALLY tight, which is why some 4inch systems drop down to 3.5inch through the rear.

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Sorry it was 5am... I was reading rwkw. I have center muffler removed, lpg, air intake, fpv Cooler and shorter gap plugs. I am getting 280rwkw+ which is about 340 fly wheel kw. Just add injectors to yours and a cat and you will have 350kw...

Just do that. Any more and you will just be asking for issues with valve springs and auto...

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