janspeed downpipe
- Thread starter boucherie
- Start date
T
Toady
Guest
jeeeesussss! 110quid for a 3" cat pipe! my mate is making me one in stainless atm, and will prob be able to sell them on here for about £60! and he doesnt do a half job either! tig welded and all! ill get some pics on here soon as i get my cam back. He also made himself a 3" downpipe from the turbo back, it is SLICK!!! 
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8)
T
Toady
Guest
im assuming its a straight thru!
boucherie
New Member
im not sure exactly, think janspeed call it the cat bypass pipe. i can asure anyone who might be interested in the 3" downpipe that we are making that they will probably sell for around £200inc delivery to gtiroc members and £220inc delivery to non members, but this will be finalised before any orders are taken.
Dooie Pop Pop
New Member
its notToady said:im assuming its a straight thru!
if you look you can clearly see the decat silencer box. 
£110 is bad enough but for a straight through :shock: pmsl :lol:
T
Toady
Guest
oh yeah so it is, i assumed it was a straight thru cos most'decats' are, i did think it was way ott for just a pipe tho! :lol:
heres a pic of the 3" pipe my mate made me...
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heres a pic of the 3" pipe my mate made me...
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Dooie Pop Pop
New Member
looks like the janspeed front mated to the goose rear
T
Toady
Guest
no unfortunately its only the goose full system, but a 3" cat pipe, dont think the engine likes it tho as there
with the step where the mongoose 2.5" pipe goes into the 3", and then steps back into the 2.5".....its now feeling sluggish, so im off out now to put the mog bit back on! will just have to get brett to make me a full 3" system!lol! :lol:
with the step where the mongoose 2.5" pipe goes into the 3", and then steps back into the 2.5".....its now feeling sluggish, so im off out now to put the mog bit back on!
will just have to get brett to make me a full 3" system!lol! :lol:
Dooie Pop Pop
New Member
:? i have oodles of low end grunt (370lbft at 3500odd rpm ) thats with a complete 3inch system.
when you change from a standard exhaust to the goose you get more torque and (i assume) the same applies to a 3" jobby. i cant see how having a larger diameter decat would effect low down power. i can understand how the step would possibly effect the pulse flow or whatever its called but that far back it shouldn' t make that much of a difference. its no different to the 'silencer' tube at the rear.
you didn' t leave a rag jammed in it did you? :lol:
) thats with a complete 3inch system.when you change from a standard exhaust to the goose you get more torque and (i assume) the same applies to a 3" jobby. i cant see how having a larger diameter decat would effect low down power. i can understand how the step would possibly effect the pulse flow or whatever its called but that far back it shouldn' t make that much of a difference. its no different to the 'silencer' tube at the rear.
you didn' t leave a rag jammed in it did you?
:lol:
T
Toady
Guest
Believe me Ive just put my mongoose pipe back on and it is rapid again! It obviously didnt like the step up causing a swirl in the gas flow. He is making me a 2.5 inch one now!
yes but u have a box, and not a straight through pipeDooie Pop Pop said::? i have oodles of low end grunt (370lbft at 3500odd rpm
when you change from a standard exhaust to the goose you get more torque and (i assume) the same applies to a 3" jobby. i cant see how having a larger diameter decat would effect low down power. i can understand how the step would possibly effect the pulse flow or whatever its called but that far back it shouldn' t make that much of a difference. its no different to the 'silencer' tube at the rear.
you didn' t leave a rag jammed in it did you?
triying putting a straight 3 inch pipe on yours dooie and see how flat it will feel low down.
Dooie Pop Pop
New Member
ok call me thicky but can you please explain why?nismoboy said:yes but u have a box, and not a straight through pipe
The box in the mongoose system or janspeed system acts as a restriction which produces back pressure, this helps the car make torque earlier giving good low end grunt, if u remove the restrition (the smallbox) and put a straight through pipe in u reduce backpressure and this pushes the torque futher up the rev range giving u less low end grunt. hope this make sense to u nowDooie Pop Pop said:ok call me thicky but can you please explain why?nismoboy said:yes but u have a box, and not a straight through pipe
Dooie Pop Pop
New Member
##nismoboy said:
:lol: yeah i get you now :lol: scuse my ignorance
torque is also effected by the intake pipe length and size iirc glad iv got a box rather than a straight pipe now :lol: still cant see how using a box rather than a straight though pipe causes more resistance though :?