Crossposting:
1.9L VW/Audi/Skoda/SEAT Diesel Mod alert! 
Quote:
Originally Posted by JasonG
I see he is next opening the exhaust. I predict there will be gains but they will be minimal.
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In a late-2007 series Julian modded a turbodiesel Peugeot 405. The first step was a
new exhaust, then a
new intake. It appears that latter the gave less results than the new muffler:
Quote:
With the new exhaust fitted, the turbo developed boost much earlier in the rev range. With the new intake, there is a very slight improvement in the revs at which appreciable boost is achieved. However, more noticeable is the way the engine now more freely revs with power. From 3500 – 4500 rpm the power output feels noticeably sharper. (Above 4500 rpm the fuel-cutting rev limiter starts to make its presence sharply felt.)
[...]
While the on-road gain is considerably less than achieved with the new muffler, the engine feels sharper at mid/high revs.
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Of course, both of these mods work best in tandem
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread