i got some hand me down aftermarket parts
i just did a b16a swap into my eg

so i put on
JDM ITR header (4-1 3 inch piping)
high flow cat
greddy evolution exhaust piping
***but i used my last piece where my muffler is and connected that to the evo piping (94 hatch cx ...small as crapt piping)
everything fit... is this a bad idea? all this good air flow and then a smal pipe to my muffler? or am i gaining back pressure which i need... trying to stay sleeper...

also do you think the ITR header is too much for the b16? when i gun it i feel nothing at lower rpm's I MEAN NOTHING>>> then finally upper rpms i feel a pull

 

the 4-1 set up on the header is designed to keep all the power in high rpms so you can shift and stay in the powerband....

that smaller piping on the end may be a little restrictive, but the larger diameter pipe in front of it will shove it out as a faster speed....nothing to worry about