88 replies to this topic

[newdawn1st]

My stainless, sounds nice and raspy, bit much on long trips tho

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[1275GTS]

this is mine on my import

[Sleepy Stu]

Quick pic of mine. Tip levels have been sorted now!

Edited by Stewart_GT, 23 May 2009 - 03:18 PM.

[Christoff-Mpi]

hello this is mine,
needs replacing tho as its pretty much frigged on the manifold downpipe was thinking bout a centre exit

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[Cooperman]

Actually the size of the final pipe does matter. The exhaust pipe diameter should be the same from the manifold merge point to the end of the tailpipe. The idea is that the molecules of exhaust gas should move at a good and constant speed down the pipe thus creating an extraction effect right at the back where it exits into the air.
Optimum sizes are 1.75" internal for a 1275 to 1380 engine running up to about 6500 rpm and 1.625" for a 998 engine.
Racing cars pulling, say, 8000 rpm, will emit more exhaust volume which needs to still travel down the pipe at the optimum speed, so they need a bigger cross-sectional area of pipe, but they don't run at less than about 5000+ rpm when being used in competition.
Personally very large pipes look a bit silly to me as I have always been interested in the performance and having spent a lot on making it go well, would be reluctant to lose several bhp by having an oversize exhaust pipe. Having the right sized pipe is the same as having the right camshaft, valve sizes and compression ratio.

[monster_mini]

just out of interest,

on a standard 998 with stage one, what would the bhp loss be if an oversized exhaust box section was fitted,


im sure i have read that minispares said 4-6 bhp.

thanks nick

[Cooperman]

just out of interest,

on a standard 998 with stage one, what would the bhp loss be if an oversized exhaust box section was fitted,


im sure i have read that minispares said 4-6 bhp.

thanks nick

That sounds about right for as 998, although the term 'Stage 1' really doesn't mean very much as it's different mods from different people.
On a 1275 or larger, having the wrong size oversize pipe will lose even more.

[camp freddy]

update

[guywithvan]

update

ever wished you could blow that hot gals skirt up at the side of the road? with a zorst like ratty's mmmm

[ProjectMusho]

standard stage 1 from MSpares. want to get a maniflow kit soon

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[mintom]

Non cat 998 with a freeflow manifold and maniflow single box side exit . Always liked this kit, it isn't a hooligan around town, yet I get the growl when I put the foot down.

[Joish]

Mine.. Playmini - Clicky

[silva_mini]

http://www.minispare...x?ty=ad&aid=314

http://www.minispare...x?ty=ad&aid=315

Two good articles that may interest anyone about to buy a new exhaust system

[Heather&Henrietta]

Here's Henrietta's

Standard centre twin




Here's Dorothy's - non standard centre split quad

[leaky]

How about this



A mini at the college I got to. They made their own exhaust.

Yes it really is that horrid.