There are perceived gains and quantifiable gains.
For example, when converting a stock CIS engine to Webers it feels like 50hp but on paper (dyno) it is only 10hp. The improvement of throttle response, the feel of extra torque and the sounds are not captured on dyno sheets. Same goes for headers. You're not going to get that screaming banshee tuned sound out of the OE heat exchangers. The bump in torque/HP doesn't look like much on paper but it is a 10% increase which is quite noticeable. Yes you can get that same 10% bump on the 3.2L with OE heat exchangers by adding a pre-muffler and chip. Adding the chip to tuned headers and the bump is 17% over stock. As with most things there are diminishing returns as the normally aspirated engine gets closer to 100% volumetric efficiency.
This is the difference:
https://youtu.be/hNnNlFDDmBE
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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