long/short headers, CRF

[bin_dubai]

i found short and long tube headers, have anyone tried them??
as to my knowldge both have effects on real cars, no idea about rc nitro engines
http://www.amainhobbies.com/product_info.php/cPath/1_23_32/products_id/13562 long
http://www.amainhobbies.com/product_info.php/cPath/1_23_32/products_id/13561 short



and any body tried the Team Orion CRF Constant Pressure Device??
http://www.amainhobbies.com/product_info.php/cPath/1_23_32/products_id/18820

also i saw a gas cooler, thought its a good idea to cool the nitro b4 going into the engine instea of the gas, what do u think all??
http://www.amainhobbies.com/product_info.php/cPath/1_23_32/products_id/33293