Exhaust size & bhp.

[Grant Monkhouse]

I would say so, otherwise you wouldn\'t be getting the full benefits of the earlier spool

[jetpilot]

I would say so, otherwise you wouldn\'t be getting the full benefits of the earlier spool

If its true :Laugh

I really hope someone does, would benefit the maker no end if his systems benefit spool up times and do a good job on noise levels!

Always seems there is a lot of silence within the community when you ask for proven results!

[lee mills]

My car was deffo quieter when i went from blitznurspec to 4" system.
 
 I think the reason why it appears quieter is because most people(me included) run huge silencers when they step up to 4" where as before we relied on off the shelf systems so you get what you get IYSWIM

[jetpilot]

My car was deffo quieter when i went from blitznurspec to 4" system.
 
 I think the reason why it appears quieter is because most people(me included) run huge silencers when they step up to 4" where as before we relied on off the shelf systems so you get what you get IYSWIM

Did you remap Lee?

[lee mills]

I did remap but not a fair comparison im afraid as i did a lot of other stuff at the same time.

[jetpilot]

I did remap but not a fair comparison im afraid as i did a lot of other stuff at the same time.

Its usually the way, people tend to do a bulk of stuff at the same time. So individual items arent tested back to back.

[Grant Monkhouse]

Well there you go, 4" quiter because of bigger silencers. And the restriction caused by these is negligible due to being a larger volume over all

[lee mills]

Its usually the way, people tend to do a bulk of stuff at the same time. So individual items arent tested back to back.

Trouble is unless your doing the mapping yourself its the costs that are involved which hinders testing each individual item.

[Grizzly]

The only 4" system i\'ve heard first hand had 2 very large boxes fitted and i thought it sounded very Tinny (might just be that one), i know he felt no diffrence in spool but then it had some wild ports.

[jetpilot]

Trouble is unless your doing the mapping yourself its the costs that are involved which hinders testing each individual item.

P.S If your still looking for a centre box Lee i have just stumbled on these, not a bad price either.

http://www.magnaflowstainlesssteelexhausts.com/mufflers/race-series-mufflers/14153-race-series-mufflers.html

[lee mills]

P.S If your still looking for a centre box Lee i have just stumbled on these, not a bad price either.
 
http://www.magnaflowstainlesssteelexhausts.com/mufflers/race-series-mufflers/14153-race-series-mufflers.html

Thats what i already have as my centre box with there 24" rear box:D

[jetpilot]

Thats what i already have as my centre box with there 21" rear box:D

:Laugh So you only want a new one for the packaging

Whats the quality like?

[lee mills]

Quality is superb.
Only prob is cant really fit a bigger rear box due to clearing the subframe and they dont seem to make a bigger oval mid box although i did find a supplier in the midlands who reckon they can make any size you want so will give them a buzz over winter i think.

[jetpilot]

Quality is superb.
Only prob is cant really fit a bigger rear box due to clearing the subframe and they dont seem to make a bigger oval mid box although i did find a supplier in the midlands who reckon they can make any size you want so will give them a buzz over winter i think.

So whats wrong with your current system, are you using a round rear box, why do you want to change it?

There are companies who will make up any size, i tried a few recommended from Pistonheads, one company wanted £600 just for a box :Nono!

[lee mills]

Nothing wrong with the system and i actually like how it sounds.
 
The car was initially built to drag race but now decided i\'d prefer to do some track days instead.
With castle coombe being my nearest track (still 100 miles away) and there noise levels being 100db im just above them.
So somehow ive got to reduce noise levels a bit so figured a slightly bigger mid box and a dolphin shaped rear tip should hopefully solve it, but im open to suggestions as the days of being able to throw money at the car have im afraid long gone.