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any 1 had a custom exhaust made by these 
thinking ill get a custom 1 made as the do it while you wait to your specs and the price ment to be around £300 mark.
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what are they made out
what are they made out of?/material
Full of ideas but no time to do them!!
www.bloodredoffroad.com
www.milneroffroad.com
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You can find Powerflow agents
You can find Powerflow agents are a bit hit and miss, As it's a franchise you can get good outlets and some not so good. As always the quality of the work depends on the staff and experience.
Some are a bit lazy and will chop off old system at the front and use existing first foot or so of factory pipe (which takes years to rust through compared to further back)
Having said that for rarer cars and/or with expensive or hard to get original systems they are a good option.
Be aware that with a Naturally Aspirated engine the pipe bore should be similar sized to the original, go for a big bore pipe and the power/torque curve will be shifted up the rev range.
The main gain in flow can be from elimintaing some of the little unnecessary bends that are sometimes a feature in orignal systems, and free flow "straight though" type silencers which don't have internal baffles.
You may find after many miles (thousands), That custom exhausts often get quite a bit louder or boomier due to the silencer wadding material becoming sooted up or burnt away. Less so (or takes much longer) with the modern cars as they run so much cleaner with the cataylst. A good guarentee may allow a free repacking or replacment in these cases.
On my GTti, It needs to run pig rich air/fuel ratio on full throttle / high boost , plus the exhaust gets hotter as the pipework has been heat wrapped. Both these soot up and burn the silencers out in about 10k of driving.
For a YRV Turbo, 2" bore
For a YRV Turbo, 2" bore pipework all the way would be ideal. 2" with straight through boxes is easily enough to cope with up to 200bhp. Even 1.8" pipework will be fine.
2.25 also OK, However 2.5" is getting a bit on the large size, You may gain a little extra top end, but the noise levels and deep "drone" big bore pipes produce becomes much harder to control, large silencers required.
2.5" is the common size for the GTti performace systems and the size I have. But really IMO it's a bit too big and simply not needed until over 200bhp.
Go too large bore and yes less restriction at high revs, but at lowre engine speeds the exhaust gases travels down the pipe slower and has more opportunity to cool down (which them makes gas move even slower).
Don't get fooled into thinking engines need "back pressure". A engine is a like a air pump, restrictions getting air in or out is going to hurt power.
"Lack of Back pressure mate" is often a phrase you hear and blamed or thought to be the cause of the lower torque problem when increasing pipework bore size, but it's actually the speed the exhaust gas where the problem lies. A correct bore pipe moves gas fast enough that it actually helps pull and suck gases out with it.
If you study some factory systems, The pipe bore often reduces in diameter slightly midway or near the rear of the car, They don't do this just for fun or to annoy power freaks., It's due to the gas cooling down travelling down the pipe, so reducing the bore slightly near the rear of car can force the gas to keep it's speed up. Good stuff from clever engineers.
Having said all that, it's less of a issue with turbocharged engines compared to Naturally aspirated, With a turbocharger you have the turbine wheel close to engine and that is the biggest restriction in the system. Less restriction after the turbo helps the turbo to spin up earlier and faster to make boost. So although you may initially have lost a little torque at low revs with a bigger bore pipe, the turbo more than makes up for it by coming onto boost harder and faster.
Of course, you can do what you like in terms of the last few inches of pipework at rear, tailpipe size and shape. Personal preference.
Been a few members on here
Been a few members on here who have had custom systems made and fitted. Daihatsu Dave had one done in Leeds a couple of years back in Stainless Steel and lifetime guarantee. Unfortunately he has now a rattle in the system, the company is honoring the Guarantee, but mean he has a long travel over the M62 to get to them to have it sorted
I on the other hand opted for a Blitz NUr-Spec-R system, which out of the box fits, have now had this on for over 4 Years and touch wood no issues. Only problem with it is it is designed for the Jap 4 Wheel YRV Turbo R so had to get some powerflex polyurahtaine exhaust hangers as that was how the exhaust was being held on by, with the original rubber exhaust hangers the exhaust would wobble a bit and catch on the back bumper
At the time the system was only £350 quid 
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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP