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Tobesetc said:I don't think you are "over thinking". In principle, if the RSR exhaust is significantly different to the exhaust that was on when you remapped, then it would need remapping, I think/agree. However, I've no idea if there is a significant difference! Others will offer better informed opinions, I'm sure.
FYI I also had mine done by Wayne (Fabspeed exhaust/cat).
Kimbo said:
I'll see your video and raise you this one Goose old boy.
Never been an RSR fan, especially when these cost £90.
911UK said:Tobesetc said:I don't think you are "over thinking". In principle, if the RSR exhaust is significantly different to the exhaust that was on when you remapped, then it would need remapping, I think/agree. However, I've no idea if there is a significant difference! Others will offer better informed opinions, I'm sure.
FYI I also had mine done by Wayne (Fabspeed exhaust/cat).
+1, get your RSR exhaust boxes by a proper engineering / exhaust specialist in the UK
so you won't loose any mid range power that those sold from the EU will result in, it is a marginal loose but it all makes a difference
Cheshire cat said:911UK said:Tobesetc said:I don't think you are "over thinking". In principle, if the RSR exhaust is significantly different to the exhaust that was on when you remapped, then it would need remapping, I think/agree. However, I've no idea if there is a significant difference! Others will offer better informed opinions, I'm sure.
FYI I also had mine done by Wayne (Fabspeed exhaust/cat).
+1, get your RSR exhaust boxes by a proper engineering / exhaust specialist in the UK
so you won't loose any mid range power that those sold from the EU will result in, it is a marginal loose but it all makes a difference
Who would you recommend then? I would have thought that Gert (or Robin Sun, the inventor in the US) were the experts at converting stock boxes into RSRs given the number they have done. What is a "proper engineering/exhaust specialist in the UK" and why would they necessarily be better than "Johnnie foreigner?" Doesn't make sense to me.
Cheshire cat said:Thank you for expanding on your earlier post. In all the replies to my original question you are the first to state that RSRs do sap some torque from the engine, which is what I was trying to understand in the first place. Does any one know how much? Has this been measured or is this all just hearsay using the "butt dyno" as our colonial cousins like to call it? Is it enough to cause a flat spot during acceleration for instance?
It isn't difficult to see how increasing flow through the boxes by removing restrictions aids engine breathing at higher revs and could also affect torque lower down. What is strange, if this reduction in torque is sufficiently significant to make a difference, is that nobody who has RSRs fitted has commented on it. I have never read a review from a customer on Gert or Robin Sun's websites that give this subject even a passing mention. What is not in doubt is that to most people's ears, fitting RSR modified boxes improves the sound of the car - "it's how they should have sounded from the factory" is often what people say - and I want some of that for my car.
Having read all the positive "just do it" responses earlier in the thread I had made up my mind to buy some and take the chance. Now I'm not so sure.
Cheshire cat said:Thanks Leo. Can I ask why you took them off in the end? On my list of 'to do's' is an upgrade to C4 or possibly RS engine mounts at some time in the fairly near future.