Meth 60 whp, downpipes 15 whp... Same price (but easier to install downpipes than meth), you chose! lol
The only thing is that with meth, you need to be committed to make sure you always have sufficient meth in the tank, but it is all worth it. At the track, meth is good for -0.5 second.
No brainer my friend...
Cheers!