How to install TRIAL Header for GT and GTS

This header is designed for the Japanese domestic market and may not work with cars outside of Japan.
This part is intended for off road and race track applications only. Use of this part on public roads of many countries is illegal.
This part should only be installed by an experienced professional. Amateur installation may result in damage to the header and your car! Trial and Trial USA are in no way responsible for damage or injury that may occur.

Header Installation. (Most work can be done from under car)
1) Remove engine mud shields, front and rear engine mount bolts and center support beam.
2) Remove front pipe and muffler if necessary.
3) Remove heat shields and muffler mid section. Save stock gaskets and screws.
4) Remove top and bottom heat shields of stock header.
5) Remove L brace that is connected to lower part of header..
6) Remove manifold bolts and nuts (7 total).
7) Remove stock manifold, without removing stock gasket between block and header. Take off stock flange gasket and put it on Trial Header.
8) Carefully insert Trial header. Tilting engine makes this task easier (two people).
9) Loosely apply bolts and nuts from inside to out of header and block.
10) Re-Install L brace to block and hand tighten to header after drilling a larger hole in brace where you see the previous bolt's mark ( about 4 mm to the outside).
11) Tighten down all bolts and nuts inside to out.
12) Attach stock upper manifold heat shield. Lower shield will not fit.
13) Re-install stock engine mounts.
14) Re-install down pipe and center pipe, reusing all stock screws and gaskets. Tighten spring bolts all the way.
15) Re-install stock heat shields to center piece.
16) Re-install Engine mud shields.





Make sure to use stock gasket.


















Make sure to use factory bolts








Source: Trial Japan